When a senior dog starts waking at night
A dog that slept through the night for years and now paces at 2 a.m. is telling you something. Sometimes the cause is simple. Sometimes the brain itself is changing with age.
Rule out the simple causes first
Cornell’s veterinary college is direct about this: cognitive dysfunction syndrome, or CDS, is diagnosed from its signs, after a veterinarian rules out everything else. Pain, arthritis, seizure disorders, systemic illness, and vision or hearing loss can all look similar. Expect a physical exam plus blood and urine tests before anyone calls it CDS.
The pattern worth watching
Cornell lists the changes owners notice first. Sleep pattern changes are on the list: wandering the house at night and sleeping more during the day. So are disorientation, like getting lost in familiar rooms or stuck in corners, house-soiling in a previously trained dog, new anxiety, and no longer responding to known commands.
AAHA’s senior care guidelines add scale to that: an estimated 14 to 22.5 percent of dogs older than eight have age-related cognitive impairment, and early recognition matters because treatment works best when started early. AAHA groups the signs under the acronym DISHAA: disorientation, changes in social interactions, sleep-wake changes, loss of house training, altered activity, and increased anxiety.
- Dogs may start to develop CDS around nine years of age or older.
- The changes progress slowly, so they are easy to wave off as normal aging.
- Early intervention with enrichment, diet and medical management can improve quality of life.
Write the nights down
A written log beats memory at the vet visit. Note when the waking happens, what your dog does during it, how much they sleep by day, and any other change from the list above. Two weeks of notes turns a vague worry into a pattern your veterinarian can use.
What can help
There is no single cure, and research continues. Cornell describes treatment as a combination: prescription diets rich in antioxidants and fatty acids, daily enrichment through play and exercise, and in some cases medication. Selegiline is approved for CDS treatment in North America, and your veterinarian may suggest supplements alongside it. The first step is still the exam.
AAHA also notes that structured questionnaires, such as the Canine Dementia Scale, can track change over time. Bringing a written log to each senior visit gives your veterinarian the same trend view between appointments.
Questions about this guide
Does waking at night prove canine dementia?
No. Cornell explains that cognitive dysfunction is diagnosed after a veterinarian rules out other causes. Pain, illness and changes in hearing or vision can produce similar signs.
What should I bring to the veterinary conversation?
Record when the waking occurs, what your dog does, daytime sleep and other changes from normal. Share existing observations promptly; there is no need to wait weeks to complete a log before seeking advice.