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My older dog and new puppy both have constant diarrhea. What's wrong?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 44 lbs

Well we have had our dog for about 5 months and she has had diarrhea for about 3-4 months constant and we just got an 8 week old puppy three days ago and no he has the same issue.

1 Answer

Most Helpful Answer

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Answered By David Darvishian

Veterinarian

Published on August 15th, 2017

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Sorry to hear that Sadie and the new puppy are having problems. Most likely this is parasite related/intestinal worms. A good broad spectrum dewormer would be advised in this case to start out with. Puppies and adult dogs can become infected and pass the parasites back and forth. The environment gets seeded with the parasite eggs and then the dogs get infected by a fecal exposure/oral ingestion route. Puppies should be dewormed every 3 weeks for at least 3-4 dewormings and adult dogs should be dewormed every 30 days along with their heartworm prevention if that is advised in your area. Intestinal parasites seem most likely because they both have it now. Other causes are possible including a dietary problem, environmental exposure to something causing diarrhea, etc. I would advise a vet check for both of them and your vet will do a physical exam and then probably advise some fecal tests to determine what parasites are involved. Once a diagnosis is made, your vet will determine a sound treatment plan for each one. Good luck with Sadie and the new puppy.

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