Cognitive dysfunction syndrome (CDS) in dogs works much like Alzheimer’s disease in people — age-related changes in the brain gradually affect memory, awareness, and learning. It is more common than most owners expect: according to the American Kennel Club, clinical signs show up in nearly one in three dogs over age 11, and by 16, almost all dogs display at least one sign.
The DISHAA Framework
Vets and behaviorists use the acronym DISHAA to describe the six areas where cognitive decline shows up. Watching for changes in these specific areas — rather than just “my dog seems different” — makes it much easier to catch early and describe accurately to your vet.
- Disorientation — getting stuck in corners, wandering aimlessly, or walking toward the hinge side of a door instead of the opening.
- Interactions — a noticeable shift in social behavior, becoming unusually clingy or unusually withdrawn compared to their normal personality.
- Sleep-wake cycle — more daytime sleeping paired with restlessness or waking at night, sometimes called “sundowning.”
- House soiling — accidents indoors from a previously house-trained dog, often because they’ve forgotten to signal or forgotten the routine entirely.
- Activity — either increased aimless restlessness or a drop in energy compared to their baseline.
- Anxiety — new fears, excessive vocalizing, or clinginess that wasn’t there before.
Some sources add a second “A” for Learning and memory, covering things like forgetting known commands or familiar people.
Why Catching It Early Matters
Cognitive dysfunction can’t be cured, but it can be slowed and managed — and the earlier it’s caught, the more options are on the table. Waiting until symptoms are severe narrows what a vet can realistically do.
What Helps
- Veterinary medication. Drugs like selegiline and propentofylline are used to help slow cognitive decline in diagnosed dogs.
- Targeted supplements. SAMe, vitamin E, and ginkgo biloba are commonly used as antioxidants to support brain health, under veterinary guidance.
- Diet. Fish oils and medium-chain triglycerides (MCTs) have shown benefit for cognitive support.
- Mental enrichment. Puzzle toys, short training sessions, and predictable exercise — ideally earlier in the day to help with evening restlessness — keep the brain engaged.
When to Call the Vet
If you notice changes in two or more DISHAA categories, it’s worth a dedicated conversation with your vet rather than writing it off as “just getting old.” A formal evaluation rules out other treatable conditions that can look similar, like vision loss, pain, or thyroid issues, and confirms whether a management plan for CDS is the right next step.
Source: American Kennel Club — Dementia in Dogs: Signs, Symptoms, and Treatments.
Photo: “Worn Out After a Walk and Backyard Play” by Pictures by Ann, licensed under CC BY 2.0.