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Is my old Shih Tzu's bloody diarrhea and weight loss kidney failure?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 16 years and 11 months old | 13 lbs

I just moved to a new city and I have an 18-year-old small shi tzu. He has been losing weight he has been experiencing increased thirst increased urination severe diarrhea with constant bright red blood in his stool and lack of appetite. I have been seeing a new vet but she doesn’t seem to be upfront with me she just wants to keep running tests and she keeps lightly mentioning that he might have kidney failure or some sort of kidney disease.

1 Answer

Most Helpful Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on February 6th, 2020

Blood work would help your vet (and you) figure out if the kidneys are functioning properly. Other tests such as for metabolic illnesses are also a good idea, as the symptoms described can also be attributed to this. It is best to get bloodwork and other tests like X-rays done so your vet can have a more complete picture of what is going on. If you don't think Sam is getting good treatment, or your vet is withholding test results, seeking a second opinion is a good idea.

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