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Why is my dog's diarrhea green after recent roundworm deworming?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | unneutered | 27 lbs

Dog had roundworm dewormer last dose on 28th and now had diarrhea all day which has now turned green.

1 Answer

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on May 1st, 2018

It is possible that if your dog had a severe round worm problem, all the dead worms now are causing the intestine to try and get rid of them as fast as possible. This is achieved by diarrhea. I would wait for another day to see whether it goes away by itself. If not, then I suggest you withhold food for about 12 hrs and then feed some bland food (boiled rice and boneless chicken) for a day and then slowly transition back to his normal food. If that does not clear it up, it is time for a vet visit.

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