Senior Dog Behaviour Changes: The 9-Change Clinical Watchlist

A gradual increase in daytime sleep is common with age. What deserves attention is a change in pattern: pacing, repeated waking, vocalization, or activity when the household is asleep. Pain, sensory loss, anxiety, or cognitive dysfunction can all interrupt senior sleep.

Disorientation — getting stuck, walking into the wrong room, standing at the wrong side of a door, or appearing lost after waking — can signal cognitive dysfunction. Similar signs may also come from vision loss, hearing loss, pain, neurological disease, or medication effects.

A previously social dog that begins to follow you everywhere, avoid touch, react fearfully to familiar situations, or growl in contexts that used to feel safe is telling you something has changed. Pain, sensory loss, anxiety, dental disease, and neurological disease can all alter how a senior dog responds to people and other pets.

A dog that stops responding to its name, startles when touched, bumps into furniture, hesitates on stairs, or becomes less confident in dim light may be losing hearing or vision — not becoming stubborn or confused. Sensory loss can also amplify behavioural changes that look like cognitive dysfunction.

Appetite, thirst, and weight changes deserve attention, not attribution to age. Eating less or refusing food, sudden increases in appetite or thirst, weight loss or gain, difficulty chewing, or dropping food can indicate dental disease, kidney disease, diabetes, endocrine disorders, gastrointestinal problems, or pain.

Each of these has a dedicated guide:

A previously house-trained dog that begins having accidents indoors is not "getting old" — it is signalling a change. Possible causes include increased urine production, urinary tract disease, gastrointestinal problems, mobility issues, pain, sensory impairment, or cognitive dysfunction.

A senior dog that becomes reluctant to climb stairs, struggles to get up, avoids jumps, walks more slowly, or loses interest in play may be developing arthritis — but reduced activity is not specific to joint disease. Cardiovascular, respiratory, neurological, and metabolic conditions can also limit exercise tolerance.

For two clinical guides:

Barking, whining, pacing, staring, or repeatedly seeking reassurance in a dog that previously did none of these is a change worth recording. The timing matters: behaviour that appears primarily at night may have a different set of explanations from behaviour triggered by exercise or being left alone.

Stopping at the door to greet family, losing interest in play, forgetting previously learned routines, or interacting differently with other pets can all indicate cognitive decline — or pain, sensory impairment, systemic disease, or neurological disorders. The pattern across several behavioural domains is more informative than a single change.