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My dog threw up a worm. Does dewormer kill them or prevent new ones?

Updated On September 23rd, 2025

Pet's info: Dog | English Mastiff | Female | unspayed | 8 months and 11 days old | 100 lbs

My dog threw up and I found a worm. Does dewormer kill worms or prevent?

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1 Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on November 12th, 2017

Thanks for using Petco Pet Education Center, formerly Petcoach! Dewormer kills worms and it does so very effectively. I recommend that you have Emma evaluated by your veterinarian to start her on a dewormer. Intestinal worms are very easily treatable and usually clinical symptoms resolve. Good luck and have a good day!

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