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Why is my 3-month puppy vomiting dark yellow, has diarrhea, won't eat?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Female | unspayed | 3 months and 12 days old | 7 lbs

My puppy about 3 months now, has been throwing up/diarrhea it started since the morning, she's not throwing up constantly. (The throw up is a dark yellow) I'm not sure if she ate something that shes not supposed to. She refuses to eat and drink water. she moves around a lot can't stay in the same spot for too long as she feels uncomfortable. When I rub her stomach is when she stays still longer and falls asleep. (Shes up to date on her vaccines)

3 Answers

Most Helpful Answer

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Answered By Dr. Leigh, DVM

Veterinarian

Published on June 19th, 2017

Luna could have an infection, parasite, upset stomach from something she ate, obstruction, etc. Since she seems uncomfortable, it would be best to have your vet do an examination to determine the cause and treat the problem. Your vet contest a stool sample for parasites and then prescribe medications to help with the vomiting and diarrhea. She may need an anti-vomiting injection, antibiotic, dewormer, antiacid, gastrointestinal protectant, or other medications to help control the vomiting and diarrhea. You could also try to feed her a small amount of boiled chicken and white rice and see if you can get her to eat a little bit of food.

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    Answered By Rebecca, DVM

    Veterinarian

    Published on

    I would recommend Luna see a vet ASAP even if that is an emergency vet tonight. Even if she is up to date on vaccines a 3 month old puppy can be at risk for peck or corona virus, parasites or a GI foreign body. A chihuahua puppy is very small and can become dehydrated or hypoglycemic very easily if she will not eat or drink. I hope she feels better soon. Please get her to a veterinarian soon.

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    Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

    Veterinarian

    Published on March 20th, 2019

    Hi, and thanks for your question. These signs could be compatible with an inflammation infection of the gastrointestinal system and surrounding organs (like pancreas and liver). A clinical examination at your local veterinarian is immediately essential to confirm these clinical suspicions and treat appropriately. Antibiotics and possibly further investigations (like abdominal imaging as ultrasound or radiographs) may be needed. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further. If this answer was helpful please let us know, this will be used to improve our service!

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