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Why is my dog throwing up and having diarrhea only at night?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 9 years and 1 month old

Buster is throwing up and pooping diarrhea. Just in the evenings. For three straight nights. At other times his behavior is normal, eating drinking coming for pets. He gets the same wet food morning and night. Can’t think of anything in the house that has changed, can’t think why he only feels poorly in the evenings.

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on May 10th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! Vomiting and diarrhea can occur secondary to conditions such as inflammatory bowel disease, dietary indiscretion, parasites, among other possibilities. I recommend that you have Buster evaluated by your veterinarian for further assessment and treatment. At the very least they can start him on medications to make him feel better and check his hydration status. In the meantime, keep water available at all times to try to prevent dehydration. Good luck and have a good day!

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