Dog Dementia and Seizures: Are They Related?
Short answer: dog dementia does not usually cause seizures, and they are not the same thing. Canine cognitive dysfunction affects memory, awareness, and behavior. A seizure is a sudden burst of abnormal electrical activity in the brain, and in a senior dog it usually points to a different cause that needs looking into. If your dog has had a seizure, the most important line on this page is this one: call your vet promptly, and treat a first-ever seizure in an older dog as something to evaluate soon, not to wait on.
Why a new seizure in a senior dog matters
When a dog who has never had seizures starts having them later in life, vets take it seriously, because the causes can be significant:
- A brain tumor, which is more common in older dogs.
- Metabolic problems, such as liver or kidney disease, or low blood sugar.
- Toxins or certain medications.
- Other neurological disease.
These need diagnosis, sometimes including bloodwork and imaging, and sometimes a referral to a veterinary neurologist. That is why a new seizure is a prompt-vet-visit situation, not a wait-and-see one.
Can dementia and seizures happen in the same dog?
Yes, they can coexist, simply because both become more likely with age. But that overlap does not mean the dementia caused the seizure. Each needs its own evaluation. Do not let a dementia diagnosis lead you, or anyone, to brush off a new seizure as “just part of it.” It is not.
What to do if your dog has a seizure
- Stay calm and keep your dog safe: clear hard objects away, do not put your hands near his mouth, and time the episode if you can.
- Film it on your phone if it is safe to. A video is enormously helpful to your vet.
- Note what happened right before and after.
- Call your vet promptly. For a long seizure (more than a few minutes) or several in a row, treat it as an emergency and go in right away.
For the broader picture of dementia signs (which do not include seizures), see our dog dementia symptoms guide.
Frequently asked questions
Does dog dementia cause seizures?
Not typically. Canine cognitive dysfunction affects thinking and behavior, not the electrical activity that causes seizures. A new seizure in a senior dog usually has another cause, such as a brain tumor, metabolic disease, or toxin, and needs prompt veterinary evaluation.
My old dog has dementia and just had a seizure. What should I do?
Call your vet promptly and have the seizure evaluated rather than assuming it is part of the dementia. The two can occur together, but a seizure needs its own workup. If a seizure lasts more than a few minutes or your dog has several in a row, treat it as an emergency.
Why is my dog pacing after a seizure?
Pacing, disorientation, and restlessness right after a seizure are part of the post-ictal phase, the brain resetting itself, and usually settle within minutes to hours. That is different from the chronic night pacing of dementia. Tell your vet about both the seizure and the pacing; they are evaluated separately.
Are seizures a sign of the final stage of dementia?
No. Seizures are not a recognized sign or stage of canine cognitive dysfunction. If a dog with dementia has a seizure, it points to a separate problem that should be investigated by your vet.
This guide is educational and is not a substitute for veterinary diagnosis or care. If you are worried about your dog, talk to your veterinarian.