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

You reach down to pet your cat and feel something wet on her chin. Or you notice a damp spot on the blanket where she was sleeping. Maybe you see a thin thread of saliva hanging from her mouth, or her chin and chest fur look matted and perpetually damp. Your old cat is drooling, and it's not something she used to do.

Drooling in cats is almost never normal. Unlike dogs, who drool freely and often without medical cause, cats are meticulous groomers who keep their mouths dry and their fur clean. A cat who is drooling, whether it's a thin trickle, thick ropy saliva, or blood-tinged fluid, is almost always telling you that something is wrong. In senior cats, the causes range from painful dental disease to organ failure, and some require prompt veterinary attention.

This guide will help you understand why your old cat is drooling, what different types of drooling can mean, when to see the vet, and what you can do to help your aging companion.

When cat drooling is not a concern

Before we explore the medical causes, there are a few situations where brief, mild drooling in a cat is considered normal and harmless.

Some cats drool slightly when they are deeply relaxed and purring, particularly during petting or kneading. This is sometimes called "happy drooling" and is a quirk certain cats have had since kittenhood. If your cat has always done this and the drooling only happens during purring and affection, it's likely nothing to worry about.

Brief drooling can also occur from an unpleasant taste. If your cat licked something bitter, ate a plant, or was given a bad-tasting medication, temporary drooling for a few minutes afterward is a normal reaction.

However, if your senior cat has started drooling when they never used to, if the drooling is persistent, if it's accompanied by other symptoms, or if the saliva is discolored or foul-smelling, this is not normal and warrants investigation.

Warning signs that need immediate veterinary attention

Some causes of drooling in senior cats are urgent. Seek veterinary care right away if your cat's drooling is accompanied by any of the following:

• Difficulty breathing: Drooling combined with open-mouth breathing, labored breathing, or panting is an emergency
• Inability to close the mouth: A jaw that hangs open or appears crooked may indicate a fracture, dislocation, or mass
• Bloody saliva: Blood in the drool suggests oral injury, a bleeding tumor, or severe dental disease
• Sudden onset with distress: If your cat suddenly begins drooling profusely and seems panicked, painful, or is pawing at their mouth, they may have a foreign object lodged in their mouth or throat
• Known or suspected toxin exposure: If your cat may have chewed on a toxic plant, licked a chemical product, or ingested something poisonous, drooling is often the first sign of toxicity
• Collapse or severe lethargy with drooling: This combination suggests a systemic crisis requiring immediate care
• Seizure activity: Drooling during or after a seizure requires emergency evaluation

If your cat is showing any of these signs, contact your veterinarian or nearest animal emergency hospital immediately. Do not attempt to examine the inside of a distressed cat's mouth yourself, as you risk being bitten and may worsen the situation.

9 common causes of drooling in senior cats

1. Dental disease (periodontal disease)

Dental disease is the single most common cause of drooling in senior cats, and one of the most common health problems in cats of all ages. Studies estimate that 50 to 90 percent of cats over the age of four have some form of dental disease, and by the senior years, most cats have significant oral pathology that can cause pain, infection, and yes, drooling.

Periodontal disease begins with plaque and tartar buildup on the teeth, which harbors bacteria. These bacteria cause inflammation and infection of the gums (gingivitis), which can progress to infection of the deeper structures that support the teeth (periodontitis). As the disease advances, the gums become red, swollen, and painful. The bone supporting the teeth erodes, teeth become loose, and pockets of infection develop around the tooth roots. Abscessed teeth, where infection creates a painful pocket of pus at the root, are common in senior cats.

All of this causes significant pain, even though many cats continue to eat. Drooling occurs because the cat's mouth is sore, inflamed, or infected, and swallowing saliva becomes uncomfortable or painful.

Signs that dental disease may be the cause:

• Bad breath, often very noticeable and foul
• Drooling that may be slightly thick or tinged with blood
• Eating on one side of the mouth, dropping food, or chewing gingerly
• Decreased appetite or preference for soft food over kibble
• Visible tartar buildup (brown or yellow crusty deposits on the teeth)
• Red, swollen, or bleeding gums
• Pawing at the mouth or rubbing the face against objects
• Resistance to having the face or mouth touched

Dental disease requires a veterinary examination, and treatment typically involves a professional dental cleaning under general anesthesia. Your vet will take dental X-rays to assess the roots and bone below the gumline, where most of the disease hides. Severely affected teeth will need to be extracted. While anesthesia in senior cats understandably worries many owners, modern veterinary anesthesia is very safe, and the relief from chronic dental pain after treatment is often dramatic. Many owners report that their cat seems years younger after a dental procedure. Cats adapt remarkably well to having teeth removed and can eat normally, even kibble, with few or no teeth remaining.

2. Tooth resorption (feline odontoclastic resorptive lesions)

Tooth resorption is a uniquely feline dental condition that affects an estimated 20 to 60 percent of all cats, with the prevalence increasing with age. In this painful condition, the body's own cells attack and erode the tooth structure, essentially dissolving the teeth from the inside out. The cause of tooth resorption is still not fully understood, but it is one of the most painful conditions that can occur in a cat's mouth.

Resorptive lesions typically begin below the gumline, making them invisible on casual inspection. As the lesion progresses, it reaches the surface of the tooth, creating a hole or defect where the tooth meets the gum. The exposed inner layer of the tooth (dentin and pulp) is exquisitely sensitive, and even gentle contact with food or the tongue can cause intense pain. Cats with resorptive lesions may drool, chatter their jaw, suddenly drop food, cry out while eating, or avoid eating altogether.

Signs that tooth resorption may be the cause:

• Sudden jaw chattering or flinching while eating
• Drooling, especially around mealtimes
• Turning the head to the side while chewing
• Visible red spots where the tooth meets the gum (though lesions are often below the gumline)
• Reluctance to eat despite showing interest in food
• Swallowing food whole rather than chewing

Tooth resorption can only be fully diagnosed with dental X-rays taken under anesthesia. Unfortunately, there is no way to save teeth affected by resorption. Extraction is the treatment of choice because it eliminates the source of pain. The prognosis after extraction is excellent, and cats experience immediate relief. If your vet suspects tooth resorption, a full dental examination with X-rays is essential because multiple teeth are often affected.

3. Oral tumors and growths

Oral tumors become more common in senior cats and are a serious cause of drooling. The most common malignant oral tumor in cats is squamous cell carcinoma, which accounts for approximately 70 percent of all feline oral cancers. This aggressive cancer can develop on the gums, under the tongue, on the palate, or in the back of the throat.

Squamous cell carcinoma in cats is unfortunately often diagnosed late because the tumors can grow in locations that are hard to see. By the time drooling and other visible symptoms appear, the tumor may be well-established. Other types of oral tumors that occur in cats include fibrosarcoma, melanoma, and benign growths like epulides or polyps. While benign growths are less dangerous, they can still cause drooling if they interfere with normal mouth function.

Signs that an oral tumor may be the cause:

• Drooling that has developed gradually over weeks and is getting worse
• Bloody or blood-tinged saliva
• Foul breath that smells different from typical dental disease odor
• A visible lump or mass in the mouth (lift the lips and look, if your cat allows it)
• Facial swelling, asymmetry, or a lump on the jaw
• Difficulty eating, especially resistance to opening the mouth wide
• Weight loss
• Loose teeth in the area of the mass
• Nasal discharge or nosebleeds (if the tumor extends into the nasal cavity)

If you notice any of these signs, schedule a veterinary appointment promptly. Diagnosis involves a thorough oral exam (often under sedation for a complete evaluation), biopsy of any suspicious tissue, and imaging (X-rays, CT scan) to determine the extent of the growth. Treatment options depend on the type, size, and location of the tumor. Some benign masses can be surgically removed with an excellent outcome. Squamous cell carcinoma, unfortunately, carries a more guarded prognosis because it tends to be locally invasive and is often advanced at diagnosis. Treatment may include surgery, radiation therapy, or palliative care focused on maintaining comfort and quality of life. Early detection significantly improves outcomes, so any unexplained oral symptom in a senior cat deserves prompt investigation.

4. Kidney disease (chronic kidney disease)

Chronic kidney disease is one of the most common conditions in senior cats, affecting up to 30 percent of cats over the age of 15, and it can cause drooling through several mechanisms. As the kidneys lose their ability to filter waste products from the blood, toxins build up in the bloodstream, a condition called uremia. These uremic toxins are irritating to the tissues of the mouth and digestive tract, causing ulcers on the gums, tongue, and inside of the cheeks. These mouth ulcers are painful and cause drooling, bad breath, and reluctance to eat.

Uremic toxins also cause chronic nausea, which itself triggers drooling. Cats with advanced kidney disease often experience waves of nausea throughout the day, and you may see them drooling, lip-licking, swallowing repeatedly, or sitting hunched over their water bowl without drinking.

Signs that kidney disease may be contributing to drooling:

• Increased thirst and urination, one of the earliest signs of kidney disease
• Weight loss, often gradual over months
• Decreased appetite that has worsened over time
• Vomiting, especially clear or foamy fluid
• Bad breath with a chemical or ammonia-like odor
• Lethargy and weakness
• Dehydration (skin that stays tented when gently pulled up)
• Unkempt coat, as the cat no longer grooms properly
• Mouth ulcers visible as red sores on the gums or tongue

Kidney disease is diagnosed with blood tests (elevated BUN and creatinine levels) and urinalysis (dilute urine). The disease is staged from 1 (mild) to 4 (severe) using the IRIS staging system. While kidney disease is not curable, it is very manageable in many cats. Treatment includes fluid therapy (subcutaneous fluids that many owners learn to give at home), prescription kidney diets (which are lower in phosphorus and have modified protein levels), anti-nausea medications like maropitant (Cerenia) and mirtazapine (which also stimulates appetite), phosphorus binders, and blood pressure management. Cats with well-managed kidney disease can live comfortably for months to years, and treating the nausea and mouth ulcers often resolves or significantly reduces the drooling.

5. Nausea

Nausea is one of the most common causes of drooling in cats of all ages, and senior cats are especially prone to it. When a cat feels nauseated, the salivary glands increase saliva production as a protective reflex, the same thing that happens in humans before vomiting. A nauseated cat may drool, lick their lips repeatedly, swallow frequently, vocalize, and may or may not actually vomit.

Many conditions common in senior cats cause chronic or intermittent nausea. Beyond kidney disease (discussed above), these include inflammatory bowel disease (IBD), pancreatitis, liver disease, hyperthyroidism, gastrointestinal lymphoma, constipation, medication side effects, and motion sickness. Even hairballs can cause nausea and drooling in the minutes before the cat brings one up.

Signs that nausea may be causing the drooling:

• Lip licking, the cat repeatedly runs their tongue over their lips or nose
• Frequent swallowing
• Drooling that comes and goes rather than being constant
• Decreased appetite or food aversion
• Vomiting, though some cats feel nauseated without vomiting
• Eating grass or unusual items (a sign of gastrointestinal discomfort)
• Hunched posture or sitting in a "meatloaf" position
• Restlessness or withdrawal before an episode

Treating nausea requires identifying and addressing the underlying cause. Your vet will likely recommend blood work, urinalysis, and possibly imaging (X-rays or ultrasound) to determine what is causing the nausea. Anti-nausea medications like maropitant (Cerenia) are very effective in cats and can provide immediate relief while the underlying cause is being investigated. Ondansetron is another anti-nausea option. If the nausea is related to a specific condition like IBD or pancreatitis, treating that condition will typically resolve the drooling as well.

6. Oral injuries and foreign objects

Even indoor senior cats can injure their mouths or get something stuck that causes sudden drooling. Common culprits include bone fragments or splinters from chewing on treats, string or thread wrapped around the tongue (this is especially common and very dangerous), sewing needles, pieces of broken toys, plant material, or burns from chewing on electrical cords.

String or linear foreign bodies deserve special emphasis. If a cat swallows thread, yarn, ribbon, or tinsel, one end can become anchored under the tongue while the rest passes down into the intestines. The intestines bunch up along the string like fabric on a drawstring, and the string can eventually saw through the intestinal wall, causing life-threatening peritonitis. A cat with string wrapped under their tongue will drool, paw at their mouth, and may have a piece of string visible under the tongue or hanging from the mouth.

Signs that an injury or foreign object may be the cause:

• Sudden onset of drooling, often profuse
• Pawing at the mouth or rubbing the face on the ground
• Gagging, retching, or difficulty swallowing
• Visible bleeding from the mouth
• String, thread, or other material visible under the tongue or hanging from the mouth
• Refusal to eat or drink
• Agitation or distress
• Swelling of the face, lips, or tongue

If you suspect a foreign object, do not attempt to pull on any string or material hanging from your cat's mouth. Pulling can cause catastrophic damage to the intestines if the string has already been partially swallowed. Instead, go to your veterinarian immediately. They can safely examine the mouth under sedation, take X-rays to look for swallowed objects, and remove the foreign body surgically if needed. For simple oral cuts or minor injuries, your vet can clean the wound and prescribe pain medication and antibiotics if necessary. Most oral injuries heal quickly because the mouth has an excellent blood supply.

7. Stomatitis (chronic gingivostomatitis)

Feline stomatitis is a severe, painful inflammatory condition of the mouth that goes far beyond ordinary dental disease. In stomatitis, the cat's immune system launches an exaggerated inflammatory response against the tissues of the mouth, causing intense redness, swelling, and ulceration of the gums, the back of the throat (caudal mucositis), the tongue, the palate, and sometimes the lips.

The exact cause of stomatitis is not fully understood, but it appears to involve an overreaction of the immune system to the bacteria present on dental surfaces. Some researchers believe that feline calicivirus, bartonella, and other infections may play a role. The condition can develop at any age but is seen frequently in middle-aged and senior cats.

Stomatitis is extremely painful. Affected cats often drool heavily because swallowing hurts. The saliva may be thick, bloody, or foul-smelling. Many cats with stomatitis want to eat but cry out or back away when they try. Weight loss is common because eating is so painful.

Signs that stomatitis may be the cause:

• Heavy, persistent drooling, often with thick or bloody saliva
• Severely bad breath
• Bright red, ulcerated, and swollen gums and mouth tissues, visible even without opening the mouth widely
• Screaming or crying when trying to eat or yawning
• Significant weight loss due to inability to eat comfortably
• Messy, matted fur on the chin and chest from chronic drooling
• Reluctance to groom
• Behavioral changes from chronic pain: hiding, aggression when touched near the face, depression

Stomatitis is diagnosed through oral examination and biopsy. Treatment can be challenging. Medical management with anti-inflammatory medications, pain control, antibiotics, and immunosuppressive drugs may provide temporary relief but often does not resolve the condition. The most effective long-term treatment for many cats is full-mouth or near-full-mouth tooth extraction. While this sounds extreme, removing the teeth eliminates the surfaces where the bacteria that trigger the immune response reside. Approximately 60 to 80 percent of cats improve significantly or achieve complete remission after full-mouth extraction. Cats without teeth can eat canned food and even dry food comfortably, and the relief from chronic oral pain is life-changing.

8. Toxin or chemical exposure

Drooling is often the first sign that a cat has been exposed to something toxic. Cats are more susceptible to many household toxins than dogs because they are fastidious groomers. Any substance that gets on their paws or fur will be licked and ingested. Additionally, cats lack certain liver enzymes that other species use to break down toxins, making some substances far more dangerous to them.

Common household toxins that cause drooling in cats include certain houseplants (lilies are extremely toxic and can cause fatal kidney failure, while plants like dieffenbachia and pothos cause immediate oral burning and drooling), essential oils and diffusers (many essential oils are toxic to cats, including tea tree, eucalyptus, citrus, and peppermint), household cleaning products, permethrin-containing flea products designed for dogs (never use dog flea products on cats), human medications, and certain foods like onions and garlic.

Bitter or unpleasant-tasting medications can also cause dramatic, though usually short-lived, drooling. If you've just given your cat a medication and they start drooling, foaming at the mouth, and acting upset, the taste is likely the culprit, not a toxic reaction. However, if the drooling persists beyond 15 to 20 minutes or is accompanied by other symptoms, contact your vet.

Signs that toxin exposure may be the cause:

• Sudden, profuse drooling, often foamy
• Pawing at the mouth
• Vomiting or retching
• Evidence of a chewed plant, opened container, or spilled substance
• Red or irritated mouth tissues
• Tremors, seizures, or incoordination (with certain toxins)
• Lethargy or collapse
• Difficulty breathing

If you suspect your cat has been exposed to a toxin, act quickly. Try to identify what the cat was exposed to, how much, and when. Call your veterinarian or the ASPCA Animal Poison Control Center (888-426-4435; a consultation fee applies) immediately. Do not induce vomiting unless specifically directed to by a veterinary professional. Do not give milk, water, or any home remedies without professional guidance. Bring any packaging, plant material, or substance with you to the vet for identification. Many toxin exposures have excellent outcomes when treated quickly, but delays can be dangerous or fatal.

9. Neurological conditions

Drooling can sometimes have a neurological origin, particularly in senior cats whose nervous systems are more vulnerable to disease. The nerves that control swallowing, tongue movement, and jaw function can be affected by various conditions, leading to an inability to swallow saliva normally even though the saliva production itself is not increased.

Brain tumors, while not common, become more likely with age and can affect the cranial nerves that control the muscles of the mouth and throat. Vestibular disease, which causes dizziness and nausea, often produces drooling secondary to the intense nausea it creates. Seizure disorders can cause drooling during and after seizure episodes. Rabies, though rare in indoor cats, is a neurological disease that famously causes drooling and must be considered in unvaccinated cats with sudden behavioral changes and excessive salivation.

Signs that a neurological condition may be involved:

• Drooling combined with difficulty swallowing or an inability to close the mouth
• Head tilt, circling, or loss of balance (vestibular signs)
• Facial asymmetry, such as a drooping lip, ear, or eyelid on one side
• Changes in behavior, personality, or mental awareness
• Seizure activity: staring spells, twitching, paddling, loss of consciousness
• Difficulty walking, stumbling, or falling
• Changes in pupil size or eye movement
• Progressive worsening of symptoms over time

Neurological causes of drooling require thorough veterinary evaluation. Your vet will perform a detailed neurological examination, checking cranial nerve function, reflexes, balance, and coordination. Advanced diagnostics may include blood work, MRI or CT scan of the brain, and cerebrospinal fluid analysis. Treatment depends on the specific condition. Vestibular disease often resolves on its own with supportive care. Brain tumors may be managed with steroids, radiation therapy, or surgery depending on location and type. Seizure disorders can often be controlled with anticonvulsant medication. If your cat shows any neurological signs along with drooling, prompt veterinary evaluation is important.

How your vet will diagnose the cause

When you bring your drooling senior cat to the vet, they will use a systematic approach to determine the cause. Here is what to expect:

History: Your vet will ask detailed questions about when the drooling started, whether it is constant or intermittent, what the saliva looks like, whether your cat is eating normally, any changes in behavior, possible toxin exposure, and your cat's overall health history.

Physical examination: A thorough exam including checking body weight, hydration status, lymph nodes, and palpating the abdomen. They will examine the outside of the mouth and face for swelling or asymmetry.

Oral examination: Your vet will attempt to look in your cat's mouth, but a complete oral exam often requires sedation because a painful mouth makes cats resistant to having it opened and examined. Under sedation, every tooth, the gums, tongue, palate, throat, and inside of the cheeks can be thoroughly evaluated.

Blood work: A complete blood count (CBC) and biochemistry panel will check for kidney disease, liver disease, diabetes, thyroid problems, anemia, and signs of infection or inflammation.

Dental X-rays: If dental disease is suspected, X-rays taken under anesthesia reveal the true extent of disease below the gumline, including tooth resorption, root abscesses, and bone loss that cannot be seen on the surface.

Additional tests: Depending on initial findings, your vet may recommend additional diagnostics such as a thyroid level (T4), urinalysis, abdominal ultrasound, chest X-rays, tissue biopsy, or advanced imaging like CT or MRI.

What you can do at home

While you should not try to diagnose or treat the underlying cause of drooling on your own, there are things you can do at home to keep your cat comfortable and gather information that will help your vet.

Monitor and document

• Note when the drooling happens: is it constant or does it come and go? Is it worse at certain times of day or around mealtimes?
• Observe what the saliva looks like: clear and watery, thick and ropy, blood-tinged, brown, or foul-smelling
• Watch your cat eat: are they chewing normally, favoring one side, dropping food, or avoiding food entirely?
• Take photos or videos of the drooling and any other symptoms to show your vet
• Track your cat's food and water intake, litter box usage, energy level, and any other changes

Keep your cat comfortable

• Gently wipe your cat's chin and chest with a warm, damp cloth to remove dried saliva and keep the skin clean and dry
• If your cat is still eating, offer soft, warm food that requires minimal chewing, the smell will be more appealing and it will be easier on a sore mouth
• Ensure fresh water is always available in multiple locations
• Remove any potential toxins from your cat's environment: toxic plants, essential oil diffusers, accessible cleaning products, or medications
• Provide a quiet, comfortable resting place where your cat can feel safe

What not to do

• Do not force your cat's mouth open to examine it if they are in pain or distressed, you will likely be bitten
• Do not pull on string or thread hanging from the mouth, this could cause life-threatening internal injuries
• Do not give human pain medications like aspirin, ibuprofen, or acetaminophen, these are toxic to cats and can be fatal
• Do not wait and see if the drooling resolves if it has lasted more than 24 hours or is accompanied by other symptoms
• Do not brush your cat's teeth if they are drooling or showing signs of oral pain, as this could worsen the problem

Treatment options for drooling in senior cats

Treatment depends entirely on the underlying cause. Here is what to expect for the most common diagnoses:

• Dental disease and tooth resorption: Professional dental cleaning under anesthesia with extraction of diseased teeth. Pain medication and antibiotics during recovery. Most cats feel dramatically better within days of having painful teeth removed
• Oral tumors: Treatment options vary by tumor type and stage and may include surgery, radiation, chemotherapy, or palliative care. Your vet may refer you to a veterinary oncologist for the most current treatment options
• Kidney disease: Fluid therapy, prescription diet, anti-nausea medication, phosphorus binders, and management of mouth ulcers with pain control. This is an ongoing management plan rather than a one-time fix
• Nausea: Anti-nausea medications while the underlying cause is identified and treated
• Stomatitis: Medical management with anti-inflammatories and pain control, or full-mouth extraction for cases that do not respond to medication
• Foreign objects: Removal under sedation or surgery, depending on location
• Toxin exposure: Decontamination, supportive care, and specific antidotes when available
• Neurological conditions: Treatment specific to the diagnosis, ranging from supportive care to medication to advanced therapies

Preventing drooling problems in senior cats

While not all causes of drooling can be prevented, you can reduce the risk of several common ones:

• Schedule regular veterinary checkups: Senior cats should see the vet at least twice a year. Routine exams catch dental disease, kidney disease, and other conditions early, before they become severe enough to cause drooling
• Maintain dental health: Ask your vet about dental care options, including professional cleanings, dental-specific diets, and whether tooth brushing is appropriate for your cat
• Cat-proof your home: Remove toxic plants, secure cleaning products, keep human medications out of reach, and avoid using essential oil diffusers around cats
• Never use dog flea products on cats: Permethrin in dog flea treatments is highly toxic to cats
• Monitor changes: Since you see your cat every day, you are the first line of detection. Any new drooling, change in eating habits, or behavioral shift in a senior cat deserves attention

Drooling in cats is easy to dismiss, especially if it starts as just a damp chin or a small wet spot on the pillow. But cats are not droolers by nature, and when a senior cat starts drooling, something is almost always going on. The good news is that most causes of drooling in older cats are treatable. Dental disease can be resolved with professional cleaning and extractions. Kidney disease can be managed for months to years with proper care. Nausea can be controlled with medication. Even serious conditions like stomatitis and some oral tumors have treatment options that can restore comfort and quality of life. The key, as with so many health issues in senior cats, is not to wait. Your old cat cannot tell you that their mouth hurts, that they feel sick, or that something they licked made them feel strange. But they are telling you the only way they can, with that drool on their chin. Listen to what it means, and get them the help they need.