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My dog has bloody diarrhea after new wet food. When to call vet?

Updated On September 23rd, 2025

Pet's info: Dog | Goldendoodle | Male | neutered | 11 months and 3 days old | 45 lbs

Mack is a very picky eater, so two days ago we started to mix in 1/4 wet food to his 3/4 dry food to make it more appetizing. He has had diarrhea a couple times and now when he went there were a few drops of blood that came out after he finished pooping. I am thinking it may just be that we gave him too much wet food too quickly, but I’m wondering if we need to take him to the vet. I am planning to have him fast for 24 hours to see if that helps.

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1 Answer

Most Helpful Answer

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Answered By Chad Brown, DVM

Veterinarian

Published on July 14th, 2018

Hello and thank you very much for your question. It is quite impressive that you are gradually trying to mix foods and did not do it cold turkey. Most people would have just switched over. The fact that there is blood in the feces is not an alarming thing unless your dog is lethargic, not eating, vomiting, and just not acting well. If, however, your dog is still playing and not showing any symptoms other than the bloody diarrhea, then I see no reason not to do the 24 hour fast. I have seen it happen many times where the addition of a different type of food can cause bloody diarrhea. But after a while, the feces starts to firm up and everything is fine. As long as your dog continues to act normal and playful, you can wait for up to three days before getting concerned enough to take him to the veterinarian. If after three days, the blood is still present in the diarrhea, then it would be best to take him to the veterinarian to do a complete physical examination as well as a fecal analysis. I hope I have helped. Have a great day

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