My indoor cat threw up a worm after deworming. Should I re-deworm?
Updated On September 23rd, 2025
Pet's info: Cat | Mixed Breed | Male | unneutered
We took in a stray and gave him dewormer. Worms were found in his poop after that dose. We repeated it two weeks later as recommended. Found no worms. Two weeks after that he just threw up a worm and he's been indoors since we got him. Do I redo the dewormer?
2 Answers
Most Helpful Answer
Published on December 13th, 2018
Submit the worm and a stool sample to your veterinarian to identify the specific parasite. You may need to repeat the deworming and then use a monthly preventative. The dewormer likely did not clear all the parasites, since it only affects the parasites at a certain stage in its lifecycle.
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on February 15th, 2020
When we deworm a pet, it only kills the worms in the body. For some types of intestinal parasites, a repeat dewormer 3-4 weeks later is required to completely rid the infection. If Fiyero is otherwise normal (good activity and eating well), he can probably wait until Monday.
1Pet Parents found this answer helpful
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