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What causes a 1-month-old puppy to throw up green-yellow vomit?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | unneutered | 1 month and 30 days old

Hi, my one month old malty poo mix threw up greenish/ yellow like vomit. Found it on his bed. I wasn’t aware, he is playing and himself as usual. The vomit is what worries me, what could it be ?

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on August 26th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be an isolated episode in which case it would not be a big concern. However, if this continues, Toby should be evaluated by a veterinarian for further assessment and treatment. Possibilities for vomiting include gastroenteritis, dietary indiscretion, parasites, among others. Good luck and have a great day!

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