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My dog had his first seizure. Is it linked to his heart murmur?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Male | neutered | 4 years and 6 months old | 100 lbs

Bandit just got done having a seizure it’s the first time it’s ever happened. What could cause this? He has a stage 3 heart murmur but no signs of getting worse and our vet says he shouldn’t have any problems with his heart since he’s on medications but than tonight he has a seizure it lasted a good 4 minutes. How concerned should I be?

1 Answer

Most Helpful Answer

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Answered By Dr. Dayna, DVM, CVA

Veterinarian, Certified Veterinary Acupuncturist

Published on October 2nd, 2017

I’m so sorry this is happening with Bandit. It could have been a true seizure, but it is also possible that it was what we call a syncopal event due to the heart not being able to supply the brain with enough oxygen. It can look almost identical to a seizure. I would really recommend he proceed to an emergency veterinarian tonight. If this is not possible, then please have him seen by his regular veterinarian tomorrow morning. They can evaluate if he needs to increase his cardiac medications or if they think it was a true seizure they will discuss testing and treatment recommendations for seizures. Good luck to you and to Bandit. I hope he improves quickly.

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