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My dog is vomiting, dark diarrhea, no appetite. What should I do?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Male | unneutered | 1 year and 2 months old | 73 lbs

My labrador is 1 year 3 months old. He suddenly started losing appetite 2 days back. Now he is vomiting and having dark diarrhoea. Is it serious? What should I do?

1 Answer

Most Helpful Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on June 6th, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Poor Posto! Causes of vomiting and diarrhea are: intestinal parasites, viral (Parvo) or bacterial infections, he ate something gross that is upsetting his stomach, ate something causing a blockage, pancreatitis, toxin ingestion, stomach ulcers, food allergy or intolerance or a reaction to a new food/treat/human food. If the diarrhea is black and tarry then I would be concerned for melena (ingested blood) which may indicate an upper gastro-intestinal bleed from an ulcer or low platelets or from a blockage. If he has melena he absolutely needs to see a Vet today. You can try fasting him for 12 hours and with hold food for 6 hours. If she doesn't vomit in the 6 hours then offer small sips of water frequently. If he holds down water then start feeding a bland diet at 12 hours. Feed 1 cup per 20 lbs per day as small frequent meals of rice with either boiled chicken or hamburger. Feed this diet until 2 normal stools. If he vomits while fasted from food or water or won't eat when food is offered he needs to see your Vet. I wish Posto the very best!

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