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How long should a dog take antibiotics for a severe urinary tract infection?

Updated On September 23rd, 2025

Pet's info: Dog | German Shepherd | Male | unneutered | 10 years and 9 months old | 95 lbs

Our 90 lb German Shepherd is on 1000mg of keflex 2x / day for 21 days. He was put on it for a severe UTI. Is this to long of a duration for the med ?

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on October 15th, 2019

In cases of severe UTI, this is an appropriate length of treatment. In some cases, treatment may go for 4 weeks or longer. As long as the bacteria is susceptible to Keflex (cephalexin), this should resolve it. It is important to perform a culture and sensitivity on a urine sample after treatment to confirm resolution.

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