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Why is my dog gassy with loose stools after taking glucosamine?

Updated on September 23rd, 2025

Pet's info: Dog | German Shepherd | Female | spayed | 9 years old | 97 lbs

My 95 lb german shepherd is a typical Addison's. She is 97 lbs and has been on 2000 mg of glucosamine for almost a month. Recently she has been gassy and has loose stools. Could the glucosamine be the cause. Her Addison's in controlled by 5 mg of prednisone every other day

1 Answer

Most Helpful Answer

Jennifer Summerfield, DVM CPDT-KA

Answered By Jennifer Summerfield, DVM CPDT-KA

Veterinarian, Certified Dog Trainer

Published on May 29th, 2017

In my experience, it would be fairly unusual for a glucosamine supplement to cause loose stools and gas - but I have had a few patients over the years who experienced similar problems after starting glucosamine, so it's certainly possible. If you want to find out for sure, you could simply stop giving the glucosamine for the next several days to see if the problem resolves. If not, or if the problem gets worse in the meantime, it would be best to see your vet for an exam to find out what else might be causing her GI issues.
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