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My cat died after deworming. Was it whipworms or the medicine?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | 5 years and 3 months old | 7 lbs

My cat vomited a large whipworm, about 5 in long, the next day I gave him worm medicine. It was liquid from the grocery store, the brand was Sergeant. The next day about 2pm my cat vomited a small amount of dry food. Half an hour later he let out a loud guttural cry arching his back, I held him & he was breathing hard, then another cry & then blood came from his mouth & nostrils, then rectum, do u think the whipworm killed him, he might have had more. I hate to get another cat without knowing

1 Answer

Most Helpful Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on January 20th, 2020

I'm sorry that your cat had such an awful passing. Unfortunately, without an exam it would be hard to say. If there was a large parasite load, dying parasites can block/obstruct the intestines, and some parasites such as heartworm can block arteries leading to death, but it would be hard to say if this or another issue was the cause of Bendingo's passing. If you do get another cat, making sure they are regularly dewormed and up to date on vaccines can help them stay healthy. Working with your vet and having regular exams done can also help check for any health issues that need treatment as well.

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