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Why does my 4-month-old puppy have normal morning poop then diarrhea?

Updated On September 23rd, 2025

Pet's info: Dog | Cane Corso | Male | unneutered | 4 months and 2 days old | 50 lbs

My dog has regular poops of the morning but they get looser throughout the day ending with very runny diarrhea. He is about 4 months old and has not had any changes in his diet or food type. This has been happening for almost a week. He does not seem like anything else is wrong. Not lethargic, still acts very normal. What could be causing this

1 Answer

Most Helpful Answer

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Answered By Dr. Elizabeth

Veterinarian

Published on November 14th, 2019

Poor Duece! The diarrhea could be due to many conditions including eating something he shouldn’t have, bacterial over growth, parasites, something in the diet (developing sensitivity) or even organ disease. If the diarrhea has continued beyond 24 hours, I recommend to have him examined by the veterinarian. With continued diarrhea, there are often bacterial shifts in the gut that will make matters worse regardless of the initial cause. Make sure to bring in a sample of fresh stool. The doctor will check him for parasites and bacterial over growth. Many times a bland diet can help and then a slow, gradual introduction to the normal food can be done. A bland diet can consist of 25% boiled white meat chicken and 75% boiled white rice. This should all be plain. A good diet in general is Royal Canin. It is low residue and highly digestible. I hope Duece starts feeling better quickly! Please feel free to post any additional questions.

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