Why is my old dog licking everything? 10 causes and how to help

Your senior dog has started licking. Not just the occasional face wash or paw clean, but a relentless, seemingly compulsive licking of floors, furniture, walls, carpets, their own body, your hands, the air itself. It goes on for minutes at a time, sometimes hours. You've tried distracting them, moving them away, even gently scolding, but they go right back to it. Something is clearly driving this behavior, and you want to understand what.

You're right to pay attention. Excessive licking in senior dogs is almost never "just a habit." In older dogs, new or intensified licking behavior usually points to an underlying medical or behavioral issue that needs attention. The challenge is figuring out what your dog is trying to tell you, because the causes range from simple nausea to serious neurological conditions.

This guide will walk you through the most common reasons why your old dog is licking everything, how to tell the difference between them, and when it's time to call the vet.

Understanding licking behavior in dogs

Before we dive into what's going wrong, it helps to understand why dogs lick in the first place. Licking is one of a dog's most fundamental behaviors. Puppies lick their mother's face to signal hunger. Dogs lick wounds because saliva contains antibacterial compounds. They lick to taste, to explore, to self-soothe, and to show affection.

Normal licking is purposeful and self-limiting: a dog licks a food bowl clean, grooms a paw for a minute, gives your hand a few licks, then moves on. Excessive licking is different. It's repetitive, prolonged, difficult to interrupt, and often directed at unusual targets like floors, walls, furniture, bedding, or the air. When veterinary researchers studied this behavior in dogs, they gave it a name: Excessive Licking of Surfaces (ELS), and found that in the majority of cases, it had a medical cause.

A landmark study published in the Journal of Veterinary Behavior found that 74% of dogs with ELS had an underlying gastrointestinal disorder, and once the GI condition was treated, the licking resolved or significantly improved. This tells us something important: excessive licking is often a symptom, not a behavioral quirk.

10 common causes of excessive licking in senior dogs

1. Gastrointestinal problems (nausea and stomach discomfort)

This is the most common medical cause of excessive licking in dogs of all ages, including seniors. When dogs feel nauseous or have stomach discomfort, they often lick surfaces obsessively. Think of it as the canine equivalent of that queasy, lip-smacking feeling humans get before being sick.

The connection between licking and nausea is well documented. Dogs with GI problems lick floors, carpets, walls, and even the air as a response to the uncomfortable sensation in their stomach. They may also drool more than usual, swallow repeatedly, eat grass, or show decreased appetite.

In senior dogs, gastrointestinal issues that can trigger excessive licking include:

• Acid reflux (GERD): Stomach acid flowing back into the esophagus causes discomfort and nausea. This is common in older dogs and may worsen when lying down, which is why some owners notice increased licking at night
• Inflammatory bowel disease (IBD): Chronic inflammation of the digestive tract that becomes more common with age
• Pancreatitis: Inflammation of the pancreas, which causes significant nausea and abdominal pain. Can be acute or chronic in senior dogs
• Gastric ulcers: Can develop from chronic NSAID use (common in senior dogs on arthritis medications), liver disease, or kidney disease
• Intestinal parasites: Even indoor senior dogs can pick up parasites, and an aging immune system may make them more vulnerable
• Foreign bodies or slow motility: The aging digestive tract moves more slowly, increasing the risk of food or other material causing partial obstructions

Key clue: If your dog's licking is focused on floors, carpets, and other surfaces (rather than their own body), and they also show signs like lip-smacking, swallowing, reduced appetite, occasional vomiting, or grass-eating, a GI issue is the most likely culprit.

2. Pain

Dogs lick as a self-soothing response to pain, and senior dogs have plenty of potential pain sources. The tricky part is that dogs don't always lick where it hurts. A dog with hip pain may lick their front legs. A dog with abdominal pain may lick the floor. A dog with a headache may lick the air. The licking is a coping mechanism, not necessarily a pointer to the pain source.

That said, localized licking, where your dog repeatedly licks one specific spot on their body, often does indicate pain or discomfort in that area. Common pain-related causes in senior dogs include:

• Arthritis: Dogs with painful joints often lick the skin over the affected joint. Wrists, elbows, hips, and knees are common targets. Over time, this can cause hair loss and thickened, darkened skin called a lick granuloma
• Back or spinal pain: May cause licking of the flank area, rear legs, or belly
• Dental pain: Dogs with sore teeth, gum disease, or oral tumors may lick their lips excessively, lick surfaces, drool, or paw at their mouth
• Post-surgical or injury pain: Even old injuries can flare up with age
• Cancer pain: Internal tumors can cause referred pain that drives licking behavior

If your senior dog is licking one specific area of their body repeatedly, have your vet examine that area carefully. X-rays or other imaging may reveal arthritis, bone changes, or masses that aren't visible from the outside.

3. Canine cognitive dysfunction (dog dementia)

Just as Alzheimer's disease changes behavior in humans, canine cognitive dysfunction syndrome (CDS) can cause repetitive, seemingly purposeless behaviors in senior dogs, and compulsive licking is one of them.

As the brain ages and changes, dogs with CDS may develop repetitive behaviors that serve no obvious purpose. Excessive licking, whether of surfaces, their own body, or the air, can become a fixed pattern in a cognitively declining brain. The dog isn't choosing to lick; their brain is stuck in a loop.

CDS-related licking is more likely if your senior dog is also showing other signs of cognitive decline:

• Disorientation or confusion, especially in familiar environments
• Changes in sleep-wake cycles (wandering or restlessness at night)
• House-training accidents in a previously reliable dog
• Decreased interaction with family members
• Staring blankly at walls or into space
• Getting stuck in corners or behind furniture
• Failure to recognize familiar people or pets
• Other repetitive behaviors like pacing, circling, or vocalization

CDS is not curable, but it can be managed with medications like selegiline, dietary supplements (SAMe, omega-3 fatty acids, antioxidants), environmental enrichment, and consistent routines. If cognitive decline is driving the licking, addressing the CDS as a whole will often reduce the behavior.

4. Anxiety and stress

Licking releases endorphins, the body's natural feel-good chemicals. For anxious dogs, licking can become a self-soothing behavior, a way to calm themselves when they're feeling stressed, fearful, or uncertain. Think of it like nail-biting or hair-twirling in anxious humans.

Senior dogs are particularly prone to anxiety because:

• Declining senses: Vision and hearing loss make the world more unpredictable and frightening
• Cognitive changes: A dog who doesn't fully understand their environment feels less secure
• Chronic pain: Living with constant discomfort raises baseline anxiety levels
• Separation anxiety: Often worsens with age, especially in dogs with cognitive decline
• Changes in routine: Moving to a new home, a new family member, loss of a companion animal, or changes in the owner's schedule
• Noise sensitivity: Many senior dogs become more sensitive to sounds like thunderstorms, fireworks, or household noises

Anxiety-driven licking often occurs in specific situations: when you leave the house, during storms, when there's household commotion, or at night when the house is quiet and there are fewer distractions. The licking may be directed at surfaces, at their own paws or legs, or at the air.

5. Skin conditions and allergies

While allergies are often associated with younger dogs, senior dogs can develop new sensitivities or see existing ones worsen with age. The aging skin barrier becomes less effective, making older dogs more vulnerable to irritation, dryness, and infection.

Skin-related causes of excessive licking in senior dogs include:

• Environmental allergies (atopy): Pollen, dust mites, and mold sensitivities can cause itchy skin that dogs address by licking, particularly their paws, belly, and groin
• Food allergies or sensitivities: Can develop at any age and cause itchy skin, especially around the face, ears, paws, and rear end
• Dry, flaky skin: Common in senior dogs, especially in winter or dry climates. Aging skin produces less oil and is more prone to irritation
• Skin infections: Bacterial and yeast infections cause itching and discomfort. Senior dogs with folds, compromised immune systems, or hormonal imbalances are more susceptible
• Hot spots: Moist, inflamed areas that develop rapidly and are intensely itchy. Licking creates a cycle: the moisture from licking worsens the hot spot, which increases the itching, which increases the licking
• Skin tumors: Lumps, bumps, and masses become more common with age. Even benign growths can be irritating enough to prompt licking

Key clue: If the licking is focused on specific body parts, especially paws (look for brown staining from saliva), belly, legs, or rear end, a skin condition is likely involved.

6. Hormonal imbalances

Endocrine disorders become increasingly common in aging dogs and can contribute to excessive licking both directly and indirectly.

• Hypothyroidism: An underactive thyroid is common in middle-aged and senior dogs. It causes skin changes including dryness, hair loss, and increased susceptibility to skin infections, all of which can trigger licking. Hypothyroid dogs may also be more prone to anxiety
• Cushing's disease (hyperadrenocorticism): Excess cortisol production thins the skin, reduces its ability to heal, and increases vulnerability to infections. Dogs with Cushing's often develop skin problems that cause itching and licking. The disease itself also causes increased appetite, which can lead to surface-licking behavior
• Diabetes: Can cause skin changes and increased susceptibility to infections. Diabetic dogs may also experience nausea that drives licking behavior

If your senior dog's excessive licking is accompanied by changes in appetite, thirst, urination, weight, energy level, or coat quality, a hormonal condition may be the underlying cause. Blood work can identify most endocrine disorders.

7. Medication side effects

Senior dogs are often on multiple medications, and some of them can cause nausea or stomach upset that drives licking behavior. Common culprits include:

• NSAIDs (non-steroidal anti-inflammatory drugs): Medications like carprofen, meloxicam, and deracoxib are widely prescribed for arthritis pain but can irritate the stomach lining, causing nausea and sometimes gastric ulcers
• Antibiotics: Many antibiotics disrupt the gut microbiome and cause nausea or stomach upset
• Prednisone and other steroids: Increase appetite and thirst, and can cause GI irritation
• Chemotherapy drugs: Often cause significant nausea
• Opioid pain medications: Can cause nausea as a side effect

Key clue: If the licking started shortly after beginning a new medication or after a dosage change, the medication is a prime suspect. Don't stop any medication without consulting your vet, but do call them to discuss the timing and explore alternatives.

8. Oral and dental problems

Dental disease is extremely common in senior dogs: by some estimates, over 80% of dogs over age 3 have some degree of periodontal disease, and it only worsens with age. Oral discomfort can drive a variety of licking behaviors.

Dogs with dental pain may:

• Lick their lips or nose repeatedly
• Lick surfaces, seemingly trying to "soothe" the discomfort
• Drool excessively
• Paw at their mouth or face
• Chew on one side or drop food
• Show reluctance to eat hard food or chew toys
• Have noticeably bad breath

Beyond periodontal disease, senior dogs can develop oral tumors (both benign and malignant), broken teeth, tooth root abscesses, and gum overgrowth. Any of these can cause discomfort that manifests as excessive licking.

Have your vet perform a thorough oral examination. Some dental problems, especially those involving tooth roots or tumors in the back of the mouth, are not visible without sedation and dental X-rays.

9. Neurological conditions

Sometimes excessive licking has a neurological origin. The brain is sending signals to lick even when there's no physical stimulus driving the behavior. In senior dogs, neurological causes of compulsive licking include:

• Focal seizures: Not all seizures involve full-body convulsions. Focal seizures can cause repetitive behaviors like lip-licking, air-licking, or fly-biting (snapping at imaginary flies). These partial seizures may look like a strange habit rather than a medical event
• Brain tumors: Tumors in certain areas of the brain can alter behavior and create compulsive patterns, including repetitive licking
• Neuropathy: Nerve damage, whether from diabetes, spinal cord disease, or other conditions, can create abnormal sensations (tingling, numbness, phantom pain) that dogs try to address by licking
• Compulsive disorder: Though more often diagnosed in younger dogs, true compulsive disorders involve dysfunction in brain circuits. These can persist or worsen into old age

Key clue: Neurological licking often has a sudden onset, may occur in episodes, and the dog may appear to be in a trance-like state during the behavior. They may be difficult to interrupt or seem confused afterward. If you notice these patterns, recording video of the behavior is extremely helpful for your vet.

10. Nutritional deficiencies

While less common than other causes on this list, nutritional deficiencies can drive abnormal licking behavior in senior dogs. As dogs age, their ability to absorb nutrients from food decreases, which can lead to deficiencies even when they're eating a "complete" diet.

Specific nutritional factors that may contribute to excessive licking:

• B vitamin deficiencies: Particularly B12 (cobalamin), which can be depleted in dogs with GI conditions. Deficiency can cause neurological symptoms including abnormal behaviors
• Zinc deficiency: Causes skin changes and lesions that can trigger licking
• Essential fatty acid deficiency: Leads to dry, flaky, itchy skin
• Pica: A condition where dogs crave and consume non-food items, which can manifest as surface licking. It sometimes reflects a nutritional imbalance or GI disorder

If your senior dog is on a restricted or homemade diet, or has a condition that affects nutrient absorption (like IBD or pancreatic insufficiency), discuss supplementation with your vet.

How to tell what's causing the licking

Because the causes are so varied, paying attention to the details of your dog's licking behavior can help narrow down the cause before you even get to the vet. Ask yourself these questions:

What is your dog licking?

• Floors, walls, and surfaces: Most commonly associated with GI problems (nausea, acid reflux), but can also indicate anxiety or cognitive dysfunction
• One specific body part: Usually indicates localized pain, skin irritation, or a mass in that area
• Paws: Often allergies, but can also be anxiety or pain referred from elsewhere
• Lips/nose: Nausea, dental pain, or oral discomfort
• The air (tongue darting out repeatedly): Can indicate nausea, focal seizures, or a response to a strange taste or sensation in the mouth
• You: Attention-seeking, anxiety, or compulsive behavior

When does it happen?

• After meals: Suggests acid reflux or GI discomfort
• Before meals or when hungry: May indicate nausea from an empty stomach or low blood sugar
• At night or when lying down: Acid reflux often worsens in a recumbent position
• When you leave or during storms: Anxiety-driven
• Constantly, regardless of situation: Cognitive dysfunction, chronic pain, or compulsive disorder
• In sudden episodes: Focal seizures

What else is going on?

• Vomiting, diarrhea, or appetite changes: Points to GI disease
• Stiffness, limping, or reluctance to move: Pain
• Confusion, disorientation, or nighttime wandering: Cognitive dysfunction
• Skin changes, hair loss, or odor: Skin disease or hormonal imbalance
• Bad breath, drooling, or difficulty eating: Dental or oral disease
• Increased thirst, urination, or weight changes: Endocrine or organ disease

When to see the vet

Any new or significantly increased licking behavior in a senior dog warrants a veterinary evaluation. While it might seem like a minor nuisance, the research is clear: the majority of dogs with excessive licking of surfaces have an underlying medical condition.

See your vet soon if the licking is:

• New and persistent (lasting more than a few days)
• Intensifying over time
• Causing damage to your dog's skin (raw spots, hair loss, lick granulomas)
• Accompanied by other symptoms like vomiting, diarrhea, appetite loss, or behavior changes
• Occurring in episodes that resemble a trance (possible seizure activity)
• Disrupting your dog's ability to eat, sleep, or rest comfortably

See an emergency vet if:

• Your dog is licking constantly and vomiting, especially if the vomit contains blood
• Your dog has a swollen, painful abdomen along with licking and restlessness
• Your dog is having episode-like behaviors that could be seizures
• Your dog appears to be in acute distress

What to expect at the vet

When you bring your senior dog in for excessive licking, your vet will likely perform:

• A thorough physical examination: Including checking the skin, coat, joints, abdomen, and mouth
• Comprehensive blood work: A chemistry panel and complete blood count to evaluate liver, kidney, pancreas, thyroid, and blood sugar levels
• Urinalysis: To assess kidney function and check for diabetes
• Fecal examination: To rule out intestinal parasites

Depending on initial findings, additional tests may include:

• Abdominal ultrasound: To visualize the GI tract, liver, pancreas, and other organs
• Endoscopy: A camera passed into the stomach and upper intestine to look for inflammation, ulcers, or masses
• Skin scraping or biopsy: If skin disease is suspected
• Dental X-rays: To evaluate tooth roots and jawbone
• Thyroid panel: If hypothyroidism is suspected
• Trial of GI medication: Sometimes a vet will prescribe an antacid like omeprazole for 2-4 weeks to see if it resolves the licking, which confirms a GI cause

Before your appointment, write down: when the licking started, what your dog licks, when it's worst, what other symptoms you've noticed, all current medications and supplements, and any dietary changes. Video of the behavior is also extremely useful.

How to help your senior dog at home

While identifying and treating the underlying cause should be the priority, there are things you can do at home to help manage and reduce excessive licking.

For suspected GI issues

• Feed smaller, more frequent meals to reduce acid buildup
• Elevate food and water bowls slightly
• Avoid feeding right before bedtime if nighttime licking is an issue
• Consider a bland, easily digestible diet temporarily (boiled chicken and rice, or a veterinary GI diet)
• Add a probiotic supplement to support gut health

For anxiety-related licking

• Maintain consistent daily routines
• Provide a safe, quiet space where your dog can retreat
• Use calming aids like Adaptil diffusers (synthetic dog-appeasing pheromone), calming music, or a Thundershirt
• Increase mental stimulation with puzzle toys, snuffle mats, and gentle training exercises
• Avoid punishing the licking, as this increases anxiety and makes the behavior worse

For skin-related licking

• Keep skin moisturized with a vet-approved moisturizing shampoo or coconut oil
• Ensure your dog is on effective flea and tick prevention
• Consider adding omega-3 fatty acid supplements to their diet
• Keep affected areas clean and dry
• Use an Elizabethan collar (cone) or recovery suit if your dog is causing self-harm through licking

For cognitive decline

• Maintain a predictable routine
• Provide gentle, positive interaction throughout the day
• Use nightlights for dogs who seem disoriented in the dark
• Consider brain-supporting supplements like SAMe, omega-3s, and medium-chain triglycerides (MCTs)
• Keep your dog's environment safe and clutter-free

General tips

• Don't punish the licking. Your dog is responding to a physical or emotional need. Punishment adds stress without addressing the cause
• Redirect gently. Offer a chew toy, a lick mat with a small amount of peanut butter or yogurt, or engage your dog in a different activity
• Use a lick mat strategically. Giving your dog an appropriate outlet for the licking urge (like a lick mat or Kong filled with food) provides enrichment and can satisfy the need to lick in a controlled way while you work on identifying the root cause
• Monitor and record. Keep a log of when the licking occurs, what triggers it, how long it lasts, and whether anything helps. This information is invaluable for your vet

Frequently asked questions

Is my old dog licking everything because they're nauseous?

Very possibly. Nausea is the single most common medical cause of excessive surface licking in dogs. If your dog is licking floors, walls, and carpets (rather than their own body), and especially if they also show lip-smacking, swallowing, reduced appetite, or occasional vomiting, GI distress is the most likely explanation. A vet visit can confirm this, and treatment is often straightforward and effective.

My dog licks their paws constantly. Is this the same thing?

Paw licking can be part of the same picture but often has a different primary cause. Constant paw licking is most commonly associated with environmental allergies (the paws pick up allergens from walking), though it can also indicate anxiety, pain elsewhere in the body, or a localized issue like a foxtail, thorn, or interdigital cyst. Look at the paws: if the fur between the toes is stained brownish-red from saliva, the licking has been going on for a while and needs attention.

Could my dog's arthritis medication be causing the licking?

Yes, it's possible. NSAIDs like carprofen and meloxicam, while excellent for managing arthritis pain, can irritate the stomach lining and cause nausea in some dogs. If the licking started after beginning or increasing a medication, tell your vet. They may adjust the dose, add a stomach protectant like omeprazole, switch to a different pain medication, or try a non-oral option like a monthly injection (Librela).

Is excessive licking a sign of dementia in dogs?

It can be, but it's important not to jump to this conclusion without ruling out more common medical causes first. Canine cognitive dysfunction can cause repetitive behaviors including excessive licking, but GI disease, pain, and anxiety are far more common explanations. If your dog has other signs of cognitive decline (disorientation, sleep changes, house-training accidents, personality changes), CDS may be contributing. But even in dogs with known cognitive dysfunction, a new licking behavior should prompt a medical workup to make sure something else isn't going on too.

When should I be concerned about lick granulomas?

A lick granuloma (also called an acral lick dermatitis) is a thickened, raised, often hairless lesion caused by chronic, repetitive licking of one spot, usually on the front legs. Once established, lick granulomas create a self-perpetuating cycle: the damaged skin itches and feels abnormal, which drives more licking, which causes more damage. Treatment requires addressing the underlying cause (pain, anxiety, infection) while also breaking the lick cycle, often with topical medications, bandaging, or an E-collar. Early intervention gives the best results.

When your old dog suddenly starts licking everything in sight, it's natural to wonder if it's just a weird new habit. In most cases, it isn't. Excessive licking is your dog's way of telling you something isn't right, whether it's a churning stomach, aching joints, an anxious mind, or a changing brain. The sooner you identify the cause, the sooner you can bring them relief. Talk to your vet, bring your notes and your videos, and trust your instincts. You know your dog best, and the fact that you noticed the change is already the most important first step.