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What's wrong with my 3-month-old puppy's diarrhea and mucus?

Updated On September 23rd, 2025

Pet's info: Dog | Poodle | Female | unspayed | 5 lbs

Hello, I have a 3-month-old puppy with liquid stools and mucus several times a day. What may be going on with it?

4 Answers

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on December 20th, 2018

Diarrhea can be caused by a food sensitivity, dietary indiscretion, intestinal parasites, an intestinal blockage, bacterial infection, viral infection, the weather, food change, stress, etc.  I would fast Lili for 12 hours and then put her on bland food for two days, such as boiled white rice and boiled white boneless chicken meat, fed in small quantities over several feeds and then transition back to regular food slowly over a few days. If this does not clear up the diarrhea or if the vomiting increases, or if your dog gets lethargic, she needs to see a veterinarian for an exam as there may be something more serious such as an infection going on.

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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 Megan, DVM, CVA

    Veterinarian

    Published on January 12th, 2018

    Poor Ziva! This could be caused from many things like parasites, eating something she shouldn’t, a sudden change in food, human food, certain viral infection, a GI obstruction, toxins and much more. You can try to withhold food for 10 hours and then offer just plain chicken (no bones) and white rice to see if this settles her tummy. If she is continuing to vomit, i would have your vet take a look at her. I worry she may become dehydrated as well since she is so small. Your vet will be able to do a fecal, blood work and even X-rays if needed and get her started on the proper meds and treatment. Your Vet will also be able to assess her hydration and give her fluids if needed. I hope this helps!

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    Answered By Dr. Rachel

    Veterinarian

    Published on June 26th, 2017

    Poor Hades! These symptoms are concerning, especially in a young puppy. Diarrhea and vomiting can be caused by internal parasites, gastroenteritis, sudden diet change, or something more serious like parvovirus. Because he is so young he is susceptible to dehydration which can eventually become life-threatening. It is important to have him seen by a veterinarian soon. A vet can perform a physical exam and recommend what type of further testing might be needed to find an answer and get him feeling back to his normal self soon.

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