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My 8-week puppy is vomiting with green, slimy diarrhea. Is it serious?

Updated On September 23rd, 2025

Pet's info: Dog | Shih Tzu | Male | unneutered | 1 month and 27 days old | 3 lbs

My puppy is an 8 week old shi tzu. He has been throwing up and had runny poop this evening and it is slimy. It also looks like it has grass in it cause it is green and smelly. We have only had him for a week and has been fine until today our vet said he looked healthy earlier in the week. Do I need to be concerned?

3 Answers

Most Helpful Answer

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Answered By Jeffrey Milner

Veterinarian

Published on July 29th, 2017

An isolated night of some vomiting and diarrhea, while stress for you and your, may not be extremely significant. I would consider switching Gizmo to something very bland like boiled chicken and rice to see if he can keep this down. You may even consider completely fasting him for 24 hours (continue to allow water). If the vomiting and diarrhea continues to persist for a total of 24 hours or if Gizmo is unable to keep down anything, you definitely need to get him into the vet for a diagnostic work up. I would describe the symptoms in detail over the phone, as it is possible your vet may want Gizmo to stay in the car until the Parvovirus can be effectively ruled out. This is an extremely contagious condition that often presents with vomiting and smelly diarrhea in young, unvaccinated puppies. Hope this helps and that Gizmo turns out fine!

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Other Answers

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    Answered By C. Rathjens, DVM

    Veterinarian

    Published on November 28th, 2018

    With just one episode, I'd recommend keeping a close eye on him, but not getting too worried. If he vomits more, has more diarrhea, or skips his next meal in the morning, he needs to go to the vet ASAP.

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on April 14th, 2019

    Poor Huxley! Feed him this band diet in small amounts 4 times a day for a couple of days. Then slowly add back in his normal diet. If the diarrhea continues on the bland diet, he starts vomiting food, stops drinking water, starts vomiting water, or becomes very lethargic, he will need to see a vet right away. I hope this helps!

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