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Dog coughing & gagging after heartworm treatment: ER vet needed?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | unneutered | 35 lbs

Our pup had his first adulticide treatment on 4/11. We have kept him as calm as we can, walking him on leash to potty, crating, etc. he has seemed to be doing well however yesterday and today he’s been coughing and gagging. Not a ton, maybe 3-4 times per day. Our vet is closed until Monday. Is this something to be super concerned about? We can take him to an emergency vet if we had to.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on April 21st, 2018

Good on you for keeping Rebel as calm as possible, but sometimes large amounts of worms die at once, leading to problems. One of these problems is coughing, and because things can quickly get worse, I do think it's best that he is seen by an ER vet right away. Other things that can happen include difficulty breathing, panting excessively, the dog becomes weak and lethargic, the dog can collapse, and a decrease in appetite. You want to avoid any severe side effects, and when a cough does develop in a dog who is getting heartworm treatment, it's best to have them seen by a vet as soon as possible. Please take him into an ER vet. Best of luck with Rebel!

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