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Puppy UTI: Why is there blood in urine after starting antibiotics?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | unneutered | 2 months and 7 days old | 9 lbs

We got an 8 week old puppy last Friday. Everything was great until Tuesday morning he started having accidents inside the house. I took him to the vet, they cathed him and diagnosed him with uti. He also had some crystals and protein in his urine. They administered a shot of antibiotics and gave me a 10 day course to start on the following day. Wednesday night he had blood tinge in his urine. Took him in on Thursday theybcathed him and said give it a couple days for abx to start working

1 Answer

Most Helpful Answer

Dr. Melanie, BVSc MS

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on December 27th, 2019

Poor Scout. I agree, give him a couple of days to see if the antibiotics help. If they don't, his urine is very blood, he appears ill, lethargic, or distressed, take him back into a vet immediately.
Vote Icon1Pet Parents found this answer helpful

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