Why is my old cat losing hair? 9 causes and what to do

You first notice it on the couch, a clump of fur where your cat was sleeping. Then you see it on the blanket, on the windowsill, on your lap after a cuddle. When you run your hand along your senior cat's back, more hair comes away than seems right. Maybe you can see patches of thinning fur, or bare skin peeking through what used to be a thick, glossy coat. Maybe your cat has been scratching or licking obsessively at certain spots until the hair is gone.

Some degree of shedding is completely normal for cats. Cats shed year-round, with heavier shedding in spring and fall as they transition between seasonal coats. But there is a clear difference between normal shedding and genuine hair loss, which veterinarians call alopecia. Normal shedding replaces old hair with new hair evenly across the coat. Alopecia involves thinning, bald patches, or an overall loss of coat density that is not replaced by new growth.

In senior cats, hair loss deserves special attention. An aging cat's body is more vulnerable to hormonal changes, immune system decline, organ disease, and skin conditions that can all manifest as a deteriorating coat. What looks like a cosmetic problem on the surface often reflects something happening deeper inside. This guide will help you understand why your old cat is losing hair, what the different causes look like, and when to seek veterinary care.

Normal aging changes vs. problem hair loss

Before exploring the medical causes, it helps to know what normal aging looks like for a cat's coat. As cats enter their senior years, you may notice some subtle, harmless changes:

• The coat may become slightly thinner or less dense than it was in younger years
• The fur may lose some of its sheen and feel drier or coarser
• Some cats develop a few gray or white hairs, particularly around the face
• Grooming may become less thorough, leading to a slightly unkempt appearance in areas they cannot easily reach, like the middle of the back

These changes happen gradually and do not involve bald patches, excessive shedding, or skin irritation. They are simply part of getting older.

However, the following patterns are not normal aging and should be investigated: bald patches or areas of visibly thin hair, hair that comes out in clumps, skin that is red, flaky, crusty, or irritated underneath, excessive scratching, licking, or chewing at the coat, hair loss concentrated in specific areas rather than general thinning, sores, scabs, or bumps on the skin, and any hair loss that develops quickly or continues to get worse.

Warning signs that need prompt veterinary attention

Some patterns of hair loss in senior cats point to a more serious problem. Contact your veterinarian soon if you notice any of the following:

• Rapid or widespread hair loss: A coat that deteriorates significantly over days to weeks suggests a systemic problem rather than a slow, localized issue
• Symmetrical hair loss: Hair falling out in a mirror-image pattern on both sides of the body is a hallmark of hormonal or endocrine disease
• Hair loss accompanied by increased thirst and urination: This combination can signal hyperthyroidism, diabetes, or kidney disease
• Open sores, ulcers, or wounds: These indicate serious skin disease, infection, or self-trauma from intense itching or pain
• Weight loss alongside hair loss: When your cat is losing both hair and weight, underlying disease is very likely
• Behavioral changes: Lethargy, hiding, loss of appetite, or personality changes along with hair loss suggest your cat is feeling unwell
• Lumps or bumps under the skin: Any mass or swelling in an area of hair loss should be evaluated to rule out skin tumors
• Intense scratching or self-mutilation: If your cat is creating raw, bleeding patches from scratching or chewing, they need relief

If your senior cat has rapid hair loss combined with weight loss, increased thirst, lethargy, or open sores, do not wait for the next scheduled vet visit. These combinations can indicate serious conditions that benefit from early treatment.

9 common causes of hair loss in senior cats

1. Hyperthyroidism

Hyperthyroidism is the most common hormonal disorder in senior cats and a frequently overlooked cause of coat deterioration and hair loss. It occurs when the thyroid gland produces too much thyroid hormone, revving up the metabolism to an unsustainable pace. Hyperthyroidism affects an estimated 10 percent of cats over the age of 10.

The excess thyroid hormone affects virtually every organ system, including the skin and hair follicles. Cats with hyperthyroidism often develop a characteristic unkempt, dull, and thinning coat. The hair may fall out more easily, and you may notice patchy thinning, especially along the flanks and belly. Some hyperthyroid cats also develop excessive grooming behaviors due to the restlessness and anxiety that come with the condition, and this over-grooming contributes to further hair loss.

Signs that hyperthyroidism may be the cause:

• Hair loss or thinning coat, often with a dull, greasy, or unkempt appearance
• Weight loss despite a ravenous appetite, this is the classic hyperthyroidism combination
• Increased thirst and urination
• Hyperactivity, restlessness, or irritability
• Vomiting or diarrhea
• Rapid heart rate or heart murmur
• Excessive grooming or pulling at fur
• Matted or clumped fur in a cat that previously groomed well

Hyperthyroidism is diagnosed with a simple blood test measuring the T4 thyroid hormone level. Treatment options include daily medication (methimazole), radioactive iodine therapy (considered the gold standard because it is curative), a prescription iodine-restricted diet, or surgery. Once the thyroid levels are brought under control, the coat usually improves significantly over several weeks to months. Most cats with treated hyperthyroidism go on to live comfortably for years. If your senior cat has a deteriorating coat combined with weight loss and a big appetite, ask your vet to check thyroid levels.

2. Allergies

Allergies are one of the most common causes of hair loss in cats of all ages, and they do not go away as cats get older. In fact, some cats develop new allergies in their senior years. The three main types of allergies in cats are flea allergy dermatitis, environmental allergies (atopy), and food allergies. All three can cause intense itching that leads to hair loss through excessive scratching, licking, and chewing.

Flea allergy dermatitis is the single most common allergic skin condition in cats. It only takes one or two flea bites to trigger a severe allergic reaction in a sensitized cat. The allergic response causes intense itching, particularly around the base of the tail, lower back, inner thighs, and belly. Affected cats often lick and chew so aggressively at these areas that they create bald patches and sometimes raw, irritated skin. Even indoor cats can be affected, as fleas can hitch a ride inside on clothing, shoes, or other pets.

Environmental allergies, also called atopic dermatitis, involve reactions to airborne allergens such as dust mites, pollen, mold spores, or household products. Food allergies in cats most commonly involve proteins like chicken, fish, beef, or dairy.

Signs that allergies may be the cause:

• Hair loss concentrated on the belly, inner thighs, lower back, or around the base of the tail
• Intense scratching, licking, or chewing at the skin
• Small scabs or crusty bumps on the skin, often along the neck and back (miliary dermatitis)
• Red, inflamed skin underneath the hair loss
• Recurring ear infections or head shaking
• Seasonal patterns that worsen at certain times of year (suggests environmental allergies)
• Hair loss that improves with flea treatment (suggests flea allergy)
• Gastrointestinal symptoms like vomiting or diarrhea alongside skin issues (may suggest food allergy)

Treatment depends on the type of allergy. For flea allergy, rigorous year-round flea prevention for all pets in the household is essential. Even one flea can trigger a flare. For environmental allergies, your vet may recommend antihistamines, corticosteroids, cyclosporine, or newer targeted therapies to manage itching. Reducing allergen exposure with air purifiers and frequent cleaning can help. For food allergies, your vet will recommend a strict elimination diet trial lasting 8 to 12 weeks, using either a novel protein diet or a hydrolyzed protein diet. Identifying and managing the allergy is key, because once the itching stops, your cat will stop over-grooming and the hair will grow back.

3. Psychogenic alopecia (stress-related over-grooming)

Cats are creatures of habit, and changes in their environment or routine can trigger a stress response that manifests as compulsive grooming. This condition, called psychogenic alopecia, involves a cat licking, chewing, or pulling at their fur so excessively that they create bald patches. The grooming becomes a self-soothing behavior, similar to how a person might bite their nails when anxious.

Senior cats can be particularly vulnerable to stress-related over-grooming. As they age, they become less adaptable to change, and events that a younger cat might take in stride can deeply unsettle an older cat. Moving to a new home, the introduction or loss of another pet, changes in the owner's schedule, construction or renovation noise, a new person in the household, or even rearranging furniture can trigger the behavior. Cognitive decline in very old cats can also contribute to anxiety and compulsive behaviors.

It is important to note that psychogenic alopecia is a diagnosis of exclusion. This means your vet should rule out medical causes, particularly allergies and skin conditions, before concluding that stress is the cause. Studies suggest that many cats initially diagnosed with psychogenic alopecia actually have an underlying medical cause for their itching that was not identified.

Signs that stress-related over-grooming may be the cause:

• Hair loss in areas the cat can easily reach with their tongue, especially the belly, inner thighs, and forelegs
• The skin underneath appears normal and healthy, not red, flaky, or irritated
• You may catch the cat grooming excessively, though many cats do it when alone
• The hair loss appeared after a stressful event or change in the household
• The remaining hair in affected areas may look stubbled or short rather than completely bald
• The cat seems anxious, clingy, or withdrawn
• No fleas or other parasites are found

If your vet determines that stress is the root cause, treatment focuses on reducing anxiety and enriching the environment. This may include environmental modifications like providing more hiding spots, vertical spaces, and quiet retreats. Pheromone diffusers like Feliway can help some cats feel calmer. Interactive play sessions and puzzle feeders provide mental stimulation. In some cases, anti-anxiety medication such as fluoxetine or gabapentin may be recommended. Identifying and addressing the source of stress is the most important step. Most cats improve once their anxiety is managed, though the behavior can recur if new stressors arise.

4. Skin infections (bacterial and fungal)

Skin infections can cause significant hair loss in senior cats, and the aging immune system makes older cats more susceptible to infections that younger cats might easily fight off. The two main categories are bacterial infections (pyoderma) and fungal infections (dermatophytosis, commonly known as ringworm).

Bacterial skin infections in cats are almost always secondary, meaning they develop on top of another problem. Allergic skin disease, wounds, bite abscesses, and areas damaged by excessive licking or scratching provide an entry point for bacteria. Once the infection takes hold, it causes additional itching, inflammation, and hair loss, creating a cycle that worsens the original problem.

Ringworm, despite its name, is a fungal infection, not a worm. It is caused by dermatophyte fungi that infect the hair shafts and surrounding skin. Ringworm causes characteristic circular patches of hair loss with scaly or crusty edges. While it is more commonly associated with kittens and young cats, senior cats with weakened immune systems, cats on immunosuppressive medications, or cats with underlying diseases are at increased risk. Ringworm is also contagious to other animals and to humans.

Signs that a skin infection may be the cause:

• Circular or irregular patches of hair loss
• Scaly, crusty, or flaky skin in the affected areas
• Redness, swelling, or warmth in the skin
• Small pustules, bumps, or oozing areas
• A ring-shaped pattern of hair loss with raised, scaly edges (classic ringworm)
• Itching that may be mild to severe
• Hair that breaks off easily at the skin surface, leaving a stubbled appearance
• Hair loss around the face, ears, and paws (common with ringworm)
• Other pets or family members developing similar skin lesions (contagious ringworm)

Diagnosis of bacterial infections involves skin cytology, where your vet examines a sample under the microscope to identify bacteria and inflammation. Ringworm is diagnosed through fungal culture (the gold standard), Wood's lamp examination (some strains fluoresce under ultraviolet light), or PCR testing. Treatment for bacterial infections includes antibiotics, either topical or systemic depending on severity, along with treating the underlying cause. Ringworm treatment typically involves a combination of systemic antifungal medication (itraconazole or terbinafine) and topical antifungal therapy (medicated baths or rinses). Ringworm treatment often takes 6 to 12 weeks. Environmental decontamination is also important to prevent reinfection and spread.

5. Parasites

Beyond fleas, several other parasites can cause hair loss in senior cats. While many people think of parasites as a problem for outdoor cats, indoor cats are not immune. Parasites can enter the home on clothing, shoes, or other animals, and some can persist in the environment for extended periods.

Ear mites, while more common in kittens, can affect senior cats and cause intense itching around the head and ears, leading to hair loss from scratching. Demodex mites cause a condition called demodicosis. There are two species that affect cats: Demodex cati and Demodex gatoi. Demodex cati lives deep in hair follicles and is typically associated with an underlying immunosuppressive condition. Demodex gatoi lives on the skin surface and is contagious between cats, causing intense itching. Cheyletiella mites, sometimes called "walking dandruff," cause flaking and mild hair loss along the back.

Signs that parasites may be the cause:

• Intense itching and scratching, especially around the head, ears, or neck
• Hair loss around the ears, face, or neck from scratching (ear mites)
• Patchy hair loss with scaly, crusty skin
• Excessive dandruff or flaking along the back (Cheyletiella)
• Dark, crumbly debris in the ears (ear mites)
• Small scabs scattered across the body (miliary dermatitis pattern)
• Visible flea dirt (tiny black specks) in the coat
• Other pets in the household showing similar symptoms

Diagnosis involves skin scrapings examined under a microscope, ear swab cytology, or response to treatment trials. Treatment varies by parasite type but typically involves topical or systemic antiparasitic medications. Many modern flea and tick preventatives also treat mites. Your vet will recommend the appropriate product and duration. All pets in the household usually need to be treated simultaneously, and environmental cleaning is important for certain parasites. The good news is that parasitic hair loss is very treatable, and once the parasites are eliminated, the hair grows back.

6. Poor nutrition

A cat's coat is a direct reflection of their nutritional status, and poor nutrition is an underappreciated cause of hair loss and coat deterioration in senior cats. As cats age, their ability to digest and absorb nutrients can decline. A diet that was adequate for a younger cat may not meet the needs of a senior cat, especially one with dental problems that make eating difficult or a chronic condition that increases nutrient demands.

Several specific nutrient deficiencies can affect coat quality. Essential fatty acids, particularly omega-3 and omega-6 fatty acids, are critical for skin and coat health. Protein is the building block of hair, and cats require more protein than many other species. Zinc, biotin, and vitamins A and E all play roles in maintaining healthy skin and fur. Senior cats with kidney disease may be on protein-restricted diets that, while necessary for kidney health, can sometimes contribute to coat thinning if not carefully balanced.

Signs that poor nutrition may be the cause:

• Generalized thinning of the coat rather than specific bald patches
• Dull, dry, or brittle fur that lacks its previous luster
• Excessive shedding without bald spots
• Slow hair regrowth after any hair loss
• Dry, flaky skin (dandruff)
• Overall poor body condition, the cat may be underweight or losing muscle mass
• Dental problems that limit food intake
• Eating a low-quality diet, a diet not formulated for senior cats, or a homemade diet that may be nutritionally incomplete

If nutritional deficiency is suspected, your vet may recommend blood work to check for specific deficiencies, a diet change to a high-quality senior cat food, or supplementation with omega fatty acids. Senior cat foods are specifically formulated with adjusted levels of protein, fat, and key nutrients to meet the needs of aging cats. If your cat has dental issues that make eating hard food difficult, switching to wet food or a smaller kibble can help. Adding a fish oil supplement (formulated for cats) can often improve coat quality within 4 to 6 weeks. Never give your cat supplements designed for humans without veterinary guidance, as some can be harmful.

7. Chronic kidney disease

Chronic kidney disease (CKD) affects up to one in three cats over the age of 15, and coat deterioration is one of the many ways this common condition manifests externally. As the kidneys lose their ability to filter waste products from the blood, toxins build up in the body, affecting virtually every organ system, including the skin and hair.

Cats with CKD often develop a noticeably poor coat. The fur becomes dull, dry, and unkempt. Hair may thin out, particularly along the back and flanks. The skin underneath may become dry and flaky. These changes happen partly because the kidneys play a role in activating vitamin D and maintaining mineral balance, both of which affect skin health. Additionally, cats with advanced kidney disease often feel nauseated and lethargic, which means they groom less, leading to a matted and disheveled appearance. Dehydration, which is common in CKD, further dries out the skin and coat.

Signs that kidney disease may be contributing to hair loss:

• Dull, dry, thinning coat with an overall unkempt appearance
• Increased thirst and urination, often the earliest and most noticeable signs of CKD
• Weight loss and muscle wasting, especially along the spine
• Decreased appetite or nausea
• Bad breath with a chemical or ammonia-like smell
• Lethargy and sleeping more than usual
• Vomiting, especially in the morning or before eating
• Mouth ulcers in advanced cases

CKD is diagnosed through blood work (elevated BUN and creatinine, often with elevated SDMA in early stages) and urinalysis (dilute urine). While CKD is not curable, early detection and management can slow progression and maintain quality of life for months to years. Treatment typically involves a kidney-supportive diet (reduced phosphorus, moderate protein), ensuring adequate hydration (some cats benefit from subcutaneous fluid therapy at home), phosphorus binders, anti-nausea medications, and managing blood pressure. As kidney function stabilizes with treatment, the coat often improves. Many cats with well-managed CKD live comfortably for years after diagnosis.

8. Skin tumors and cancer

The risk of skin tumors increases with age, and hair loss over or around a mass is sometimes the first sign that something is growing beneath the surface. While not all skin tumors are cancerous, any new lump, bump, or area of hair loss in a senior cat should be evaluated by a veterinarian.

Several types of skin tumors can cause localized hair loss in cats. Squamous cell carcinoma, particularly on the ears, nose, and eyelids of white or light-colored cats, can cause crusting, ulceration, and hair loss at the site. Mast cell tumors can appear as small, firm bumps that may be itchy and cause surrounding hair loss. Basal cell tumors are the most common skin tumor in cats and usually present as a firm, raised lump with thinning hair over it. Fibrosarcomas can develop as firm masses under the skin. Cutaneous lymphoma is a form of cancer that can cause widespread skin changes including hair loss, redness, scaling, and thickened skin.

Signs that a skin tumor may be the cause:

• Hair loss centered around a lump, bump, or raised area on the skin
• A sore or ulcer that does not heal
• A crusty or scabby area, particularly on the ears, nose, or eyelids
• A firm mass under the skin with overlying hair loss
• Itching or irritation focused on a specific area
• Changes in the color or texture of the skin in the affected area
• A wound or lesion that has been slowly growing over weeks or months
• Widespread, patchy skin changes with scaling and redness (possible cutaneous lymphoma)

Any new or changing skin lesion in a senior cat should be evaluated by a veterinarian. Diagnosis typically involves a fine needle aspirate, where a small needle is inserted into the mass to collect cells for microscopic examination. If the aspirate is inconclusive or suggests malignancy, a surgical biopsy may be recommended. Treatment depends on the type of tumor. Benign tumors may only need monitoring or simple surgical removal. Malignant tumors may require wider surgical excision, radiation therapy, or chemotherapy depending on the type and stage. Many skin tumors in cats are treatable, especially when caught early. Regular hands-on checks of your senior cat, feeling for lumps and noting any changes in the skin, can help catch tumors before they advance.

9. Autoimmune skin disease

Autoimmune skin diseases occur when the immune system mistakenly attacks the body's own skin cells, leading to inflammation, hair loss, and skin damage. While these conditions are relatively rare in cats compared to other causes of hair loss, they do occur and can be particularly challenging to diagnose and manage.

Pemphigus foliaceus is the most common autoimmune skin disease in cats. It causes pustules, crusting, and hair loss, typically starting on the face and ears and sometimes spreading to the paws and other areas. The condition can wax and wane, with periods of relative calm followed by flare-ups. Alopecia areata is another autoimmune condition that causes smooth, well-defined patches of hair loss without skin inflammation. Systemic lupus erythematosus is rare but can affect the skin along with other organs.

Signs that autoimmune skin disease may be the cause:

• Crusting, scabbing, and hair loss on the face, particularly around the nose and ears
• Pustules or blisters on the skin that rupture and form crusts
• Hair loss around the nail beds, with thick or deformed claws
• Smooth, well-circumscribed bald patches with no skin irritation (alopecia areata)
• Symptoms that come and go or progressively worsen
• Fever, lethargy, or joint stiffness alongside skin changes (may suggest systemic lupus)
• Poor response to antibiotics or antifungal treatment

Diagnosis of autoimmune skin disease requires skin biopsies examined by a veterinary dermatopathologist. The biopsy findings reveal characteristic patterns of immune-mediated damage that differentiate these conditions from infections or allergies. Treatment for pemphigus and other autoimmune skin diseases involves immunosuppressive medications, with corticosteroids (prednisolone) being the first-line therapy. Some cats require additional immunosuppressive drugs like chlorambucil or cyclosporine. Treatment is usually lifelong, as these conditions tend to relapse when medication is stopped. While managing autoimmune skin disease requires commitment and regular veterinary monitoring, many cats achieve good control and maintain a comfortable quality of life on appropriate therapy.

How your vet will diagnose the cause

Because the causes of hair loss are so varied, your vet will take a systematic approach to identifying what is happening with your senior cat's coat. Here is what to expect:

History and physical exam: Your vet will ask when you first noticed the hair loss, whether it is getting worse, where on the body it is occurring, whether your cat is itchy, what they eat, what medications they take, whether they go outdoors, and what other symptoms you have noticed. A thorough physical exam includes palpating for lumps, checking the skin under the remaining fur, examining the ears, mouth, and nails, and assessing overall body condition.

Skin diagnostics: Several quick tests can be performed during the office visit. Skin scraping looks for mites. Fungal culture or PCR tests for ringworm. Skin cytology examines a sample for bacteria, yeast, and inflammatory cells. A Wood's lamp may be used as a preliminary ringworm screen. Hair plucking (trichography) examines the hair shafts under the microscope to determine if the hair is being broken off (from scratching or licking) or falling out from the root (from a follicular problem).

Blood work: A complete blood panel checks for systemic conditions that affect the coat. A thyroid level (T4) checks for hyperthyroidism. Kidney and liver values assess organ function. A complete blood count checks for infection and inflammation. Depending on the clinical picture, your vet may also test for feline leukemia virus (FeLV) and feline immunodeficiency virus (FIV), as these can predispose cats to skin infections.

Dietary elimination trial: If food allergy is suspected, your vet will recommend a strict elimination diet using a novel protein or hydrolyzed protein food for 8 to 12 weeks. This is the only reliable way to diagnose a food allergy, as blood tests for food allergies in cats are not considered accurate.

Skin biopsy: If initial tests are inconclusive or an autoimmune condition or tumor is suspected, your vet may recommend a skin biopsy. Small samples of affected skin are taken under sedation or local anesthesia and sent to a veterinary dermatopathologist for analysis.

What you can do at home

While the underlying cause of your senior cat's hair loss needs veterinary attention, there are supportive measures you can take at home.

Support skin and coat health

• Feed a high-quality senior cat food with adequate protein and omega fatty acids. Look for foods listing a named animal protein as the first ingredient
• Ask your vet about adding a fish oil supplement formulated for cats. Omega-3 fatty acids support skin barrier function and can reduce inflammation
• Ensure your cat always has access to fresh, clean water. Proper hydration is essential for healthy skin
• If your cat has dental problems that make eating difficult, switch to wet food or soften dry food with warm water

Reduce stress

• Keep your cat's routine as consistent as possible. Feed at the same times, keep litter boxes in the same locations, and minimize household disruptions
• Provide safe, quiet retreats where your cat can hide and rest undisturbed
• Consider pheromone diffusers (Feliway) in rooms your cat frequents. These can help reduce anxiety
• If there has been a recent change in the household, give your cat extra time and patience to adjust
• Provide environmental enrichment with puzzle feeders, window perches, and gentle interactive play

Prevent parasite problems

• Keep all cats in the household on year-round flea prevention, even indoor-only cats
• Regularly wash your cat's bedding in hot water
• Vacuum frequently, especially areas where your cat sleeps

Assist with grooming

• Senior cats may need help with grooming, especially in areas they cannot easily reach. Gentle brushing a few times a week removes loose hair, stimulates the skin, and distributes natural oils
• Use a soft brush or grooming glove, as senior skin can be more sensitive
• While brushing, take the opportunity to check for lumps, bumps, scabs, or areas of irritation
• Do not bathe your cat unless your vet recommends it, as excessive bathing can strip natural oils and worsen skin dryness

Keep track of changes

• Take photos of the areas of hair loss weekly. This creates a visual record that helps you and your vet track whether the condition is improving, stable, or worsening
• Note any other changes in your cat's behavior, appetite, water intake, litter box habits, and energy level
• Record what you are feeding, any supplements, and any treatments so you can provide accurate information to your vet

Treatment options by cause

The right treatment depends entirely on the diagnosis. Here is a summary of how the different causes of hair loss are typically managed:

• Hyperthyroidism: Medication (methimazole), radioactive iodine therapy, prescription diet, or surgery. Coat usually improves within weeks to months of treatment
• Allergies: Flea prevention for flea allergy, elimination diet for food allergy, antihistamines or immunosuppressive drugs for environmental allergies. Hair regrows once itching is controlled
• Psychogenic alopecia: Environmental enrichment, stress reduction, pheromone therapy, and possibly anti-anxiety medication. Hair regrows once over-grooming stops
• Skin infections: Antibiotics for bacterial infections, antifungal medication for ringworm, plus treatment of any underlying cause. Hair regrows after infection clears
• Parasites: Antiparasitic medications targeted to the specific parasite, treatment of all pets in the household, and environmental cleaning
• Poor nutrition: Diet upgrade to high-quality senior formula, possible omega fatty acid supplementation, treatment of any dental issues affecting eating
• Chronic kidney disease: Kidney-supportive diet, hydration management, and supportive medications. Coat improves as overall health stabilizes
• Skin tumors: Treatment varies by type, from monitoring to surgery, radiation, or chemotherapy. Many tumors are treatable when caught early
• Autoimmune disease: Immunosuppressive medication, usually lifelong. Good control is achievable for most cats

When it is an emergency

Hair loss itself is rarely an emergency, but certain accompanying symptoms require urgent care:

• Sudden, severe hair loss with skin ulceration or open sores: This may indicate a drug reaction, severe infection, or rapidly progressing condition
• Hair loss with signs of systemic illness: Fever, complete loss of appetite, extreme lethargy, or difficulty breathing alongside hair loss suggest a serious underlying condition
• Self-trauma causing open wounds: If your cat has scratched or chewed themselves raw and bleeding, they need pain relief and wound care
• Rapidly growing or ulcerating skin mass: A mass that is changing quickly or has broken open should be evaluated promptly
• Hair loss with jaundice: Yellowing of the skin, gums, or whites of the eyes alongside hair loss can indicate liver disease and requires immediate veterinary attention

Your senior cat's coat tells a story about what is happening inside their body. A healthy cat has a coat that is full, soft, and well-groomed. When that coat starts thinning, falling out in patches, or losing its shine, it is a signal that something has changed. Sometimes the cause is as straightforward as fleas or a dietary gap, something easily identified and corrected. Other times, it points to a deeper issue like thyroid disease, kidney disease, or an immune system gone awry. The important thing is not to dismiss hair loss as "just getting old." While aging does bring subtle coat changes, significant hair loss always has a cause, and most of those causes are treatable. The sooner you bring it to your vet's attention, the sooner you can get answers and start helping your cat feel, and look, better. Your old cat may not be able to tell you something is wrong, but their thinning coat is speaking for them. Listen.