Excessive licking in senior dogs is rarely just a quirky habit. It usually signals an underlying physical or cognitive issue that has developed with age. The most common triggers are gastrointestinal problems, dental disease, cognitive decline, anxiety from sensory loss, and nutritional deficiencies. Understanding which one is driving the behavior can help you get your dog the right care faster.
Stomach and Digestive Problems Are the Top Cause
When a dog licks floors, walls, furniture, and other surfaces compulsively, veterinarians call it Excessive Licking of Surfaces, or ELS. A study published in the Journal of Veterinary Behavior found that 74% of dogs with ELS had an underlying gastrointestinal disorder. That’s a striking number, and it means a stomach problem should be one of the first things you rule out.
The specific GI conditions identified in affected dogs included inflammatory infiltration of the stomach or intestinal lining, delayed gastric emptying, irritable bowel syndrome, chronic pancreatitis, and intestinal parasites like giardia. One dog even had a foreign object lodged in its stomach. Many of these conditions cause chronic low-grade nausea, and licking surfaces appears to be a dog’s way of coping with that queasy feeling, similar to how a nauseated person might swallow repeatedly.
If your senior dog’s licking is focused on hard surfaces rather than their own body, and it seems to come and go or worsen after meals, a digestive issue is a strong possibility. Some dogs also swallow excessively, lip-smack, eat grass, or have softer stools alongside the licking. These clues point even more strongly toward the GI tract.
Dental Disease Gets Worse With Age
Periodontal disease affects the vast majority of dogs by middle age, and it progresses as dogs get older. Tartar buildup irritates the gums, causing inflammation (gingivitis) that can advance into deeper infection of the tissues anchoring the teeth. According to USDA guidance on canine dental health, signs of advanced periodontal disease include excessive drooling, licking, pawing at the face, facial swelling, and difficulty chewing.
A dog with a painful mouth may lick compulsively because the motion provides temporary relief, or because loose teeth, infected gums, or fractured teeth create a persistent irritation they’re trying to address. You might also notice your dog dropping food, chewing on only one side, or being reluctant to play with toys they used to enjoy. Bad breath that’s gotten noticeably worse is another red flag.
Cognitive Decline Changes Brain Function
Canine cognitive dysfunction syndrome (CDS) is essentially the dog equivalent of dementia. It involves physical changes in the brain, including neuronal loss, shrinking of white matter, and buildup of abnormal proteins. These changes affect how a dog processes information and controls behavior.
Veterinarians assess cognitive decline using a framework called DISHAA, which tracks six categories of behavioral change: disorientation, altered social interactions, disrupted sleep-wake cycles, house soiling and loss of learned behaviors, altered activity levels, and increasing anxiety. Repetitive behaviors like compulsive licking can emerge as part of the altered activity and anxiety components. A dog whose brain is deteriorating may get stuck in behavioral loops, repeating the same action without an obvious trigger or purpose.
CDS also damages the brain’s smell-processing pathway, from the nasal lining through the olfactory bulb and into deeper brain structures. Dogs experiencing smell disturbances may lick more as a way to gather sensory information through taste when their primary sense is failing them. If your dog also seems confused in familiar spaces, stares at walls, wanders at night, or no longer greets family members the way they used to, cognitive decline could be a factor.
Sensory Loss Creates Anxiety
Senior dogs commonly develop both nearsightedness and hearing loss from degeneration of the inner ear. These sensory changes are a normal part of aging, but they make the world less predictable. A dog that can’t hear you approach or can’t see clearly across the room startles more easily, feels less secure, and may develop generalized anxiety.
Licking is a well-documented self-soothing behavior in dogs. It releases endorphins, creating a mild calming effect. For an anxious senior dog, licking surfaces, objects, or even the air can become a go-to coping mechanism. You might notice the licking intensifies during storms, when the household is noisy, when routines change, or when the dog is left alone. Agitation, restlessness, and clinginess often accompany anxiety-driven licking.
Some dogs develop true compulsive disorders where the licking takes on a life of its own, persisting even after the original trigger is gone. Compulsive licking can target surfaces, their own paws or flanks, or even their owners. When the licking becomes so persistent that it interferes with eating, sleeping, or moving around, it has crossed from coping into compulsion.
Nutritional Gaps and Other Medical Causes
Nutritional deficiencies can drive dogs to lick or consume non-food items in an attempt to replenish what their body is missing. Senior dogs are more vulnerable to this because aging affects nutrient absorption, and appetite changes may mean they’re eating less or eating less varied food. Underlying conditions like thyroid problems, diabetes, and general malnutrition also contribute. If your dog is licking unusual surfaces or trying to eat things like dirt, fabric, or drywall, a nutritional imbalance is worth investigating through bloodwork.
Allergies, skin conditions, and pain from arthritis or other age-related problems can also increase licking. When a dog licks a specific body part repeatedly, that’s more likely a pain or itch response than a behavioral issue. A dog licking their joints may be dealing with arthritis pain; one licking their rear end could have anal gland problems or a urinary tract infection.
What You Can Do at Home
Start by observing the pattern. Note when the licking happens, what surfaces or body parts your dog targets, and whether it correlates with meals, being alone, or certain times of day. This information is genuinely useful for a veterinary visit because the cause of ELS often isn’t obvious on a basic exam.
For dogs whose licking seems tied to boredom or mild anxiety, environmental enrichment helps. Interactive food puzzles, time-release treat toys, and regular gentle exercise (adjusted for your dog’s mobility) give the brain something productive to focus on. Even short, slow walks or scent-based games engage a senior dog’s mind without overtaxing their body.
Calming aids like pressure wraps and pheromone sprays can take the edge off anxiety-driven licking for some dogs. These are reasonable first steps, though dogs with more severe anxiety or compulsive behavior often need prescription support to break the cycle.
The most important step is getting a veterinary workup that includes bloodwork, a dental exam, and potentially imaging or a GI evaluation. Because the licking so frequently traces back to a treatable physical condition, especially digestive issues, identifying and addressing the root cause often reduces or eliminates the behavior entirely. A dog that’s been licking walls for months because of chronic nausea may stop within days once the nausea is treated. That’s a far better outcome than assuming it’s “just an old dog thing” and letting it continue.