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UTI in Dogs: Causes, Symptoms, Treatment and Prevention

By the Dog Health Handbook team · Updated · Fact-checked against current veterinary references (see sources)

Key takeaways

  • UTIs are common in dogs, especially females; E. coli is the usual cause.
  • Signs: frequent small pees, straining, blood in the urine, accidents and licking.
  • Straining with little or no urine can mean a blockage: go to a vet right away.
  • A urine test, ideally with a culture, confirms a UTI and rules out look-alikes like bladder stones.
  • Simple UTIs usually clear with 3 to 5 days of an antibiotic such as amoxicillin.
  • Don't give human UTI medicines; phenazopyridine can be toxic to dogs.

Table of Contents

How dogs get UTIs Signs Go away on its own? Diagnosis Treatment Prevention FAQ Sources

Urinary Quicklinks

Bladder Overview Signs and Symptoms Urinary Incontinence Overview UTI Overview Kidney Disease Kidney Failure Signs Kidney Diet

A urinary tract infection (UTI) in dogs is usually a bacterial infection of the bladder, also called bacterial cystitis. It's one of the most common infections in dogs: an often-cited estimate is that about 14% of dogs have one during their lifetime.1,2 Female dogs are affected more often, and E. coli is the most common cause.3,4 Most UTIs clear up quickly with a short course of antibiotics, but some keep coming back, and some signs that look like a UTI are caused by other problems, including emergencies.5,4,6 This guide explains how dogs get UTIs, the signs, how vets diagnose and treat them, and how to lower the risk.

Go to a vet right away if your dog:

  • Strains to urinate but passes little or no urine, or only dribbles. A blocked urethra is an emergency, and male dogs are more prone to it.6,7
  • Has fever, lethargy, vomiting or a poor appetite along with urinary signs, which can mean a kidney infection8,5,9
  • Has a lot of blood in the urine, or seems in pain10,6

How Does a Dog Get a UTI?

Most UTIs happen when bacteria from the skin and the area around the genitals travel up the urethra into the bladder and get past the body's defenses.3,8,4 Some dogs are more likely to get them:3,8,4

  • Female dogs, because their urethra is shorter and closer to the anus
  • Dogs with a recessed (hooded) vulva, where skin folds trap moisture and bacteria11,12
  • Dogs with diabetes, Cushing's disease or kidney disease, or those on long-term steroids or other drugs that suppress the immune system
  • Dogs that can't empty the bladder fully, including dogs with urinary or fecal incontinence or spinal problems such as disc disease
  • Dogs with bladder stones or bladder tumors

Signs of a UTI in Dogs

  • Peeing more often, in small amounts5,4
  • Straining or discomfort when urinating5,3
  • Blood in the urine, often at the end of the stream8,13
  • Accidents in the house, or peeing in unusual places3,4
  • Strong-smelling urine and licking the genitals4

Some dogs have bacteria in the urine without any signs. See dog UTI symptoms for how to tell a UTI from look-alikes such as bladder stones.

Can a Dog's UTI Go Away on Its Own?

Don't count on it. Bacteria in the urine of a dog without symptoms sometimes clear on their own, and treating this "subclinical bacteriuria" usually isn't helpful.3,5 But a dog with symptoms of a UTI should see a vet. An untreated or poorly treated bladder infection can spread to the kidneys, and other conditions, from bladder stones to cancer, can look like a UTI.8,10

How Vets Diagnose a UTI

  • Urinalysis: checks the urine for bacteria, white blood cells and blood.4,3
  • Urine culture: grows the bacteria and shows which antibiotics will work. Guidelines prefer a culture for all suspected UTIs, though vets may start treatment for a simple first infection while waiting for results.5,3
  • Sample collection: the best sample is taken with a fine needle straight from the bladder (cystocentesis), which avoids contamination.14,5
  • Imaging and blood tests for dogs whose UTIs keep coming back, to look for stones, tumors and underlying illness.5,8

How Are UTIs in Dogs Treated?

A simple bladder infection is usually treated with a short course of an antibiotic such as amoxicillin, typically for 3 to 5 days, plus pain relief if needed.5,3 Dogs usually improve quickly. Tell your vet if your dog isn't better within about 2 days of starting treatment.5,4 Kidney infections, prostate infections in male dogs and recurrent UTIs need longer or different treatment.5 See dog UTI treatment and home remedies.

Don't give human UTI medicines. Urinary pain relievers containing phenazopyridine can be toxic to dogs.15,16

Preventing UTIs

  • Keep fresh water available, and give plenty of chances to pee during the day.8,17
  • Keep your dog at a healthy weight, especially if she has a recessed vulva.11,12
  • Keep the genital area clean, and work with your vet to control conditions such as diabetes or incontinence.17,5

For dogs that keep getting infections, see recurrent bladder infections in dogs.

Frequently Asked Questions

How did my dog get a UTI?

Usually bacteria from the skin around the genitals travel up into the bladder. Female dogs, dogs with a recessed vulva, and dogs with diabetes, Cushing's disease, incontinence or bladder stones are at higher risk.

Can a dog's UTI go away on its own?

Bacteria in the urine of a dog without symptoms can sometimes clear on their own, but a dog with UTI symptoms should see a vet. Untreated infections can spread to the kidneys, and other conditions can look like a UTI.

How long does a UTI last in a dog?

With the right antibiotic, most simple bladder infections improve within a couple of days, and treatment usually lasts 3 to 5 days. Call your vet if there's no improvement within about 48 hours.

Is a UTI in dogs an emergency?

Usually not, but straining with little or no urine can mean a blockage, which is an emergency. Fever, vomiting or lethargy with urinary signs can mean a kidney infection and needs prompt care.

What can be mistaken for a UTI in dogs?

Bladder stones, bladder cancer, prostate disease, diabetes, Cushing's disease and incontinence can all cause similar signs. That's why a urine test is important.

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Sources and further reading

This article was rewritten and fact-checked on October 13, 2026 against current veterinary references and specialist guidelines:

  1. Fonseca JD, et al. Results of urinary bacterial cultures and antibiotic susceptibility testing of dogs and cats in the UK. Journal of Small Animal Practice, 2021.
  2. Ross SJ. Managing difficult urinary tract infections. dvm360 (proceedings), 2010.
  3. Whitehouse W. Bacterial cystitis in small animals. Merck Veterinary Manual, updated June 2025.
  4. Cornell University College of Veterinary Medicine, Riney Canine Health Center. Urinary tract infections.
  5. Weese JS, et al. International Society for Companion Animal Infectious Diseases (ISCAID) guidelines for the diagnosis and management of bacterial urinary tract infections in dogs and cats. The Veterinary Journal, 2019.
  6. American College of Veterinary Surgeons. Urinary stones, October 2024.
  7. Llera R, Hunter T, Ward E. Bladder stones in dogs. VCA Animal Hospitals, June 2024.
  8. Brown SA. Infectious diseases of the urinary system in dogs. Merck Veterinary Manual (pet owner version), updated September 2024.
  9. Whitehouse W. Pyelonephritis in small animals. Merck Veterinary Manual, April 2025.
  10. Burke A. UTIs in dogs: when UTI symptoms might be a sign of something worse. American Kennel Club, 2021.
  11. Scully CM. Recessed vulva in dogs. Merck Veterinary Manual, updated September 2024.
  12. Weir M, Barnette C. Recessed vulva. VCA Animal Hospitals, June 2026.
  13. Weir M, Hunter T, Ward E. Cystitis in dogs. VCA Animal Hospitals, July 2023.
  14. Barnes C, et al. Urinalysis. VCA Animal Hospitals, July 2024.
  15. Cornell University College of Veterinary Medicine. Small animal toxins.
  16. American College of Veterinary Pharmacists. Phenazopyridine (pet poison control list), 2023.
  17. Maharaj N. Urinary tract infections (UTI) in dogs: what to know. American Kennel Club, February 2024.

About this article

Last updated : fully rewritten as our main guide to urinary tract infections in dogs, using the 2019 ISCAID veterinary guidelines and current Merck Veterinary Manual, Cornell, VCA and ACVS guidance; added causes, warning signs, diagnosis, treatment, prevention, a key takeaways summary and FAQ.

This page is for general information and is not a substitute for an exam by your veterinarian.