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The signs of aging worth acting on are changes in what a dog does, not how he looks: avoiding stairs, jumps and the car, stiffness getting up, sleeping more by day and restlessness or pacing at night, house soiling, and confusion in familiar places. Each has more than one possible cause, from arthritis to cognitive dysfunction, which is why they go to a vet.
The grey muzzle everyone notices tells you almost nothing. The signs that matter arrive as things your dog quietly stops doing.
Start with what has been dropped
What did your dog do last year that he does not do now?
- The sofa, and the bed
- Jumping into the car
- Taking the stairs at speed instead of one at a time
- Meeting you at the door
- The second half of the walk
The AVMA names a common cause of activity change directly: arthritis. Most of its list of signs is not limping. Favouring a leg, walking stiffly, difficulty sitting down or standing up, sleeping more, resisting being touched or petted, playing less, and showing unusual aggression towards people or other pets.
Rule of thumb: A painful dog looks like a grumpy dog. Snappiness earns a pain assessment before it earns a behavior label.
The way he gets up is the most useful thing you can watch
Not the walk: the stand-up from lying down, on a hard floor, after a long nap. Film it once a month, same room, same angle. You will not notice the change day to day, and you will across three clips, and it is the most useful thing you can hand a vet.
The stand-up after a nap, on a hard floor, is the moment to film once a month from the same angle.
The cognitive cluster
Physical change is one track. The other is the brain: the AVMA describes cognitive dysfunction, similar to senility in people, as a cause of behavior changes in older dogs.
Its list of common behavior changes in senior pets with cognitive dysfunction:
- Acting disoriented or confused
- Increased wandering
- Changes in sleep patterns
- House soiling
- Increased anxiety
- Increased barking
- Increased reaction to strange or loud sounds
- Increased aggressive or protective behavior
- Less interest in playing
- Repeating the same actions over and over
- Decreased response to voice commands
- Poorer memory and learning ability
It is a cluster, not a checklist, and one item on its own means little.
The same sign, two lists
Several signs sit on both AVMA lists, which is why a vet has to sort them rather than you:
| What you see | On the arthritis list | On the cognitive dysfunction list |
|---|---|---|
| Sleeping more, or a changed sleep pattern | Yes | Yes |
| Less interest in playing | Yes | Yes |
| Unusual aggression or protectiveness | Yes | Yes |
| Difficulty sitting down or standing up | Yes | No |
| Disorientation, wandering, repeating actions | No | Yes |
| House soiling | No | Yes, and of several medical conditions |
House soiling is the one that most often gets mishandled. It reads as a training failure, and it is on both the cognitive list and the medical one.
Remember: House soiling is a phone call, not a retraining project.
Restless at night: pacing and "sundowning"
An old dog who sleeps through the afternoon and then paces, pants or wanders the house at night is one of the most common reasons owners start searching. VCA's cognitive dysfunction guidance describes exactly that pattern: dogs sleep more during the day and then become restless, often pacing during the night. Cornell's Riney Canine Health Center lists wandering the house at night and sleeping more by day among the signs, and says dogs may start to develop cognitive dysfunction syndrome from around nine years of age. The Merck Veterinary Manual includes changes in sleep patterns in its description.
"Sundowning" is the owners' word, borrowed from human dementia care. The veterinary sources call it a change in the sleep-wake cycle, and they do not treat it as the only explanation. VCA's note on unusual sleep behaviors lists anxiety as another cause of night pacing, and says a pet who keeps circling and getting up may be in pain from arthritis; a cough that shows only at night can point to heart disease.
What that means in practice:
- See the vet before you treat it. VCA's first step in treating a behavior problem, at any age, is a full medical and behavioral assessment.
- Leave medication to the vet. Cornell and VCA name selegiline as the drug approved for canine cognitive dysfunction in North America, alongside prescription diets. None of it is something to start on your own, and human sleep aids are not a substitute.
- At home, small changes help. VCA suggests more frequent toilet trips, extra lighting for a dog losing his sight, and continuing to play together.
Sight, hearing and the quiet compensations
It is normal for dogs to lose some sight and hearing with age. The AVMA notes that a dog with poor eyesight or even blindness can still get around well in familiar surroundings, and advises against rearranging or adding furniture that could become an obstacle.
The same page has a piece of forward planning: teaching hand signals while a dog can still hear makes it far easier to communicate once hearing fades. If your dog is middle-aged and healthy, pair a hand signal with every cue he already knows, this year, while it costs you nothing. Our guide to recall at home works the same way with a visual marker added.
Weight, in either direction
The AVMA links excess weight in a senior dog to arthritis, diabetes, heart disease and more, and says sudden weight loss often means something is wrong. Either direction, if it happened quickly, is a call rather than a change of food.
What to do at home while you wait for the appointment
None of this is treatment. It removes the daily friction that makes everything look worse than it is.
- Traction. Runners along the routes he uses most; a two-by-six such as the TTelephant covers the hallway or the run to the water bowl, where the sliding starts.
- Access. A ramp or steps for the sofa, the bed and the car, so he is not choosing between a jump and giving up. Foam steps like the EHEYCIGA four-step suit a small dog who has lost confidence rather than strength; a big dog and a low sofa want the Pet Gear Easy Step II, two extra-deep steps at a six-inch rise; the car wants the PetSafe Happy Ride ramp, 62 inches long, folding in half.
- A better bed. Supportive, with a low side to step over. Our orthopedic bed picks are chosen for this stage; the JOYELF memory-foam bolster has the open front a stiff dog walks onto rather than over.
- Support for stairs. A lift or support harness such as the GingerLead sling turns a frightening staircase into a two-of-you job, and a non-slip runner addresses the floor for a dog who is skating rather than struggling.
- Keep the brain working. Reduced play is on the cognitive list, so replace lost physical activity with mental work: a food puzzle asks nothing of the joints, and a snuffle mat like the AWOOF can be worked lying down. See brain games for senior dogs.
The AVMA itself names orthopedic beds, raised feeders, and stairs and ramps as changes that help an arthritic dog feel more comfortable: a rare case of gear advice and veterinary advice being the same sentence.
Write it down, then take it in
Keep a dated note on your phone: what you saw, which day, what he was doing.
What tells you almost nothing:
- The grey muzzle
- Ten minutes at the vet, where adrenaline masks everything
- A description reconstructed from memory in the consulting room
What to ask your vet
- Is what I am seeing when he stands up consistent with pain, and can we do a pain assessment?
- Are these behavior changes worth investigating for cognitive dysfunction, or do they point somewhere else?
- Is his weight helping or hurting at this point?
- Given his size and breed, where is he in his expected lifespan?
If you are not sure whether your dog counts as a senior at all, when is a dog a senior covers where the line comes from, and the senior stage page has the rest of the picture.
Enter an age. Size matters: bigger dogs are usually counted as seniors sooner.
Approximate. AAHA gives no fixed ages: it defines life stages by development, not by birthdays, and publishes no inclusive ages at all for mature adult or senior. These windows are ours, built so you can find the right page. A dog a month either side of a line is the same dog.
Full dog age calculator — three published methods side by side
Tools for this
- Care-Path Finder
Answer what you can see and check which care page fits. Health changes go to your vet.
Key takeaways
What to remember
- The AVMA lists behavior changes as often the first sign of aging, and notes they may come from pain, from failing sight or hearing, from disease, or from cognitive dysfunction.
- Arthritis usually shows up as avoidance before it shows up as limping: no more sofa, no more car, hesitating at the stairs.
- Cognitive dysfunction has a recognisable cluster: disorientation, disrupted sleep, house soiling, increased anxiety, repeating actions, and reduced response to cues.
- Sleeping more by day and pacing at night is a recognised sign of canine cognitive dysfunction, per VCA and Cornell, but pain and anxiety cause it too. Treatment, including selegiline, is the vet's call.
- Sudden weight change in either direction is a reason to call, not a reason to adjust the food bowl.
- Write down what you see and when. A dated list is far more useful to a vet than an impression.
Questions people ask
- Is slowing down just normal aging?
- Some of it is, and some of it is arthritis or another condition that is treatable. The AVMA notes a common cause of activity change is arthritis and lists avoiding running, jumping, stairs and getting into cars among the signs. It is worth having checked rather than assumed.
- What are the signs of cognitive dysfunction in dogs?
- The AVMA's list includes acting disoriented or confused, increased wandering, changes in sleep patterns, house soiling, increased anxiety, increased vocalisation, repeating the same actions, less interest in playing, decreased response to voice commands, and poorer memory and learning.
- Why is my old dog restless and pacing at night?
- VCA describes dogs with cognitive dysfunction sleeping more during the day and then becoming restless, often pacing, at night, and Cornell lists wandering the house at night among the signs. VCA also names anxiety and arthritis pain as causes of night-time restlessness. A vet assessment sorts out which, before any medication.
- Is sundowning real in dogs?
- It is an owners' word borrowed from human dementia care. Veterinary sources describe the same pattern as a change in the sleep-wake cycle associated with cognitive dysfunction syndrome, which Cornell says may start from around nine years of age. The treatment options, including selegiline and prescription diets, go through your vet.
- My old dog has started having accidents indoors. Is that behavioral?
- Do not assume so. House soiling appears on the AVMA's cognitive dysfunction list, and it is also a sign of several medical conditions. It is a call to the vet, not a retraining project.
- Should I worry about a grey muzzle?
- No. Greying is cosmetic and not a reliable indicator of anything. What your dog has stopped doing is far more informative than what colour he is going.
- How do I tell pain from stubbornness in an old dog?
- Often you cannot, which is the point. The AVMA lists resisting being touched, unusual aggression, sleeping more and difficulty sitting or standing among arthritis signs, and all of them read as mood from the outside. A pain assessment answers it.
Gear
Gear for this stage
The products this piece assumes, in the order we would get them. Prices move; check before you buy.
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Bedside steps for a small or ageing dog
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A low sofa and a wide dog — two extra-deep 16-inch-wide steps at a six-inch rise
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Getting a stiff dog into an SUV or estate
TTelephant Non-Slip Floor Runner
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The hallway or the run to the water bowl
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Taking real weight off weak hind legs
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The mainstream choice — a memory-foam base with three-sided bolsters and an open front the dog can walk straight onto.
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The cheapest way to tire a dog out with their nose
Sources
- AVMA: Senior pets — The AVMA senior age bands by adult weight, the list of care areas that change in senior dogs, the signs of arthritis, and the behavior changes associated with cognitive dysfunction.
- AAHA 2019 Canine Life Stage Guidelines: Canine Life Stage Definitions — The four AAHA life stages, senior defined as the last 25 percent of estimated lifespan, the refusal to use human-year equivalents, and the statement that stages phase in and out gradually.
- AAHA 2019 Canine Life Stage Guidelines: Behavior — That roughly 6 months to 3 years is the period owners find most challenging, that there is no medical reason to delay puppy classes until the vaccine series is finished if hygiene is managed, and that puppies generally do not outgrow behavior problems.
- VCA Animal Hospitals: Behavior Counseling, Senior Pet Cognitive Dysfunction — The sleep-wake change in cognitive dysfunction, with dogs sleeping more by day and restless or pacing at night; a full medical and behavioral assessment as the first step; selegiline as the one medication licensed for canine cognitive decline in North America; and the home adjustments of more frequent toilet trips, extra lighting and continued play.
- VCA Animal Hospitals: Unusual pet sleep behaviors to watch out for — Night pacing in senior pets from cognitive dysfunction or anxiety, arthritis pain stopping a pet getting comfortable, and night-only coughing as a sign of disease such as heart disease.
- Cornell Riney Canine Health Center: Cognitive dysfunction syndrome — Onset from around nine years of age, wandering the house at night and sleeping more during the day, restlessness and pacing, prescription diets, and selegiline as the medication approved for the condition in North America.
- Merck Veterinary Manual: Behavior Problems in Dogs — That cognitive dysfunction signs include changes in sleep patterns, and that medication and a special diet can delay the progression of signs but not reverse them.
Not veterinary advice — for anything medical, ask your vet.
Next step
Check whether your dog is in the senior band yet
Several of the changes above are worth watching in a nine-year-old and worth an appointment in a fourteen-year-old, and the band is what tells them apart.