It Was a Tuesday
My own dog, a 13 year old Beagle mix named Kavi, had been living in our house for eleven years. He knew every corner, every doorway, every path from bed to food bowl to backyard. So when I watched him walk to the hinge side of the back door and stand there, staring at the wall, clearly expecting it to open, something inside me went cold.
He wasn't blind. His eyes were fine. He wasn't confused about wanting to go outside. He knew what he wanted. He just couldn't remember which side of the door opened.
As a veterinarian, I should have seen this coming. I knew the early signs. I'd diagnosed cognitive decline in hundreds of patients. But when it's your own dog, in your own kitchen, the clinical knowledge evaporates and you're just a person watching their best friend lose a piece of themselves.
What Canine Cognitive Dysfunction Actually Is
Canine Cognitive Dysfunction Syndrome (CDS) is a progressive neurodegenerative condition that affects older dogs. It's the closest analog to Alzheimer's disease in humans. The brain accumulates beta amyloid plaques, loses neurons, and undergoes structural changes that impair memory, learning, awareness, and behavior.
It's not rare. Studies suggest that 28% of dogs aged 11 to 12 and 68% of dogs aged 15 to 16 show at least one sign of cognitive dysfunction. Yet it's dramatically underdiagnosed, because most owners attribute the symptoms to "normal aging" and never bring them up at vet visits.
The Signs That Came Before the Door
Looking back, the signs were there before that Tuesday. I just wasn't connecting them:
- Kavi had started staring at walls or into corners for no apparent reason. Just standing and staring, sometimes for minutes.
- His sleep pattern had shifted. He was restless at night, pacing and sometimes vocalizing, then sleeping more during the day.
- He'd stopped greeting me at the door. Not because he didn't want to, but because by the time he processed that I was home, the moment had passed.
- He'd gotten lost behind furniture. He'd walk behind a chair and then seem unable to figure out how to back up or turn around to get out.
- His house training had slipped. A dog who hadn't had an accident in a decade was now occasionally urinating indoors.
Each sign on its own was easy to explain away. Together, they painted a clear picture that I, the veterinarian, didn't want to see.
The DISHAA Framework
In veterinary medicine, we use the acronym DISHAA to screen for cognitive dysfunction:
- Disorientation: Getting lost in familiar places, going to the wrong side of doors, not recognizing familiar people
- Interactions: Changes in social behavior, less interested in petting, less responsive to family members
- Sleep/wake cycle: Restless at night, sleeping more during the day, pacing or vocalizing at night
- House soiling: Loss of previously reliable house training
- Activity: Changes in activity level, aimless wandering, repetitive behaviors, decreased interest in play
- Anxiety: New anxiety, increased clinginess, fear of familiar things, sundowner behavior (worsening in evening)
If your dog is showing signs in two or more of these categories, it's worth discussing with your vet.
What I Did for Kavi
Once I accepted what I was seeing, I put together a management plan. There's no cure for CDS, but there are things that can slow progression and improve quality of life:
Environmental Enrichment
Mental stimulation is to the aging brain what exercise is to aging muscles. I increased Kavi's daily enrichment: puzzle feeders at every meal, short training sessions (yes, old dogs can learn new tricks, and the process matters more than the trick), sniff walks where he led the way, and novel textures and scents to explore.
Routine and Consistency
A predictable daily routine reduces anxiety and helps a cognitively impaired dog navigate their day. Same feeding times, same walking schedule, same bedtime routine. I kept furniture in the same places and avoided rearranging his environment.
Nutritional Support
There's growing evidence that certain nutrients support brain health in aging dogs. Omega 3 fatty acids (DHA in particular), antioxidants (vitamins E and C, beta carotene), and medium chain triglycerides (MCTs from coconut oil) have shown benefit in studies. I also started Kavi on a supplement containing Nicotinamide Riboside, because the research on NAD+ and neuronal health is compelling. NAD+ levels decline significantly in aging brains, and supporting those levels may help maintain cellular function in neurons. I use LongTails, which combines NR with other supportive ingredients. Whether it's making a measurable difference for Kavi is something I can't prove definitively, but the science behind supporting NAD+ in aging brains is sound enough that I feel it's worth including.
Medication
I discussed pharmaceutical options with Kavi's primary vet (yes, my own dog sees a different vet, because treating your own family members is a terrible idea). Selegiline (Anipryl) is FDA approved for canine CDS and works by increasing dopamine levels in the brain. We started him on it and have seen modest improvement in his nighttime restlessness.
Light and Routine for Sleep
Bright light exposure during the day and a dark, quiet environment at night help regulate circadian rhythm, which is disrupted in CDS. We added a short outdoor session in bright sunlight each afternoon and made his sleeping area darker and quieter at night.
Where Kavi Is Now
He still has CDS. It's progressive and it will continue to change him. But the management plan has helped stabilize things. The nighttime restlessness has improved. He's more engaged during the day. He still goes to the wrong side of the door sometimes, but less often.
The hardest part isn't the management. It's the grief. Watching your dog's mind change is a unique kind of heartbreak, because the body is still there but the personality is slowly shifting. He still knows me. He still loves his walks. He still curls up next to me on the couch. But parts of him are getting quieter, and I'm learning to love the dog he is now while missing the dog he was.
What I Want You to Take From This
Don't dismiss cognitive changes as "just aging." If your dog over 10 is showing signs in the DISHAA categories, bring it up with your vet. Early intervention, when signs are mild, gives you the most time and the most impact.
And know that even with CDS, there is still so much quality of life to protect and enjoy. It's different. But it's still life. And it's still worth fighting for.