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My puppy has severe diarrhea for days. Why isn't medicine working?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | unneutered | 4 months and 8 days old | 29 lbs

My puppy has had severe diarrhea since Monday. My boyfriend bought the wrong food for him and he only fed it to him once. We gave him anti diarrhea medicine and nothing has helped. Please help, because I am beginning to worry.

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1 Answer

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Answered By Jessica Keay, DVM

Veterinarian

Published on September 9th, 2017

I am very sorry to hear about your puppy. What a cutie he is! In young dogs like this, we do worry very much about other causes of diarrhea such as intestinal parasites (worms but also protozoal parasites such as coccidia and giardia) and viral infections (such as parvo virus). If your puppy is lethargic, has decreased appetite, has blood in the stool, or is vomiting I would recommend taking him to the vet right away because these can be signs of parvo virus which can make them very sick. If he is still energetic then I would consider a bland diet (plain cooked rice and boiled shredded chicken breast) and a probiotic (such as https://www.petco.com/shop/en/petcostore/product/vetri-science-laboratories-vetri-mega-probiotic-dog-and-cat-capsules) until your vet's office reopens (hopefully monday) and then making an appointment for an exam. The vet will want to check his stool for these parasites and may need to prescribe an antibiotic for potential bacterial overgrowth and to help decrease inflammation in the GI tract.

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