Recurrent Bladder Infections in Dogs: Why UTIs Keep Coming Back and What Helps

Why Does My Dog Keep Getting UTIs?

• A recessed (hooded) vulva: skin folds around the vulva trap moisture and bacteria. It's common, often overlooked, and worse in overweight dogs.^5,6,7
• Bladder stones or tumors that harbor bacteria or irritate the bladder lining^4,8,3
• Hormone and metabolic diseases: diabetes and Cushing's disease are common but easily overlooked causes, and many affected dogs show no urinary signs.^9,3,4
• Problems emptying the bladder: urinary or fecal incontinence, spinal disease and incomplete emptying^4,3,2
• Immune-suppressing medicines, including long-term steroids and chemotherapy^4,10
• Prostate infection in intact male dogs¹
• Treatment problems: the wrong antibiotic, or resistant bacteria^4,10

"Recurrent" infections can be a new infection with different bacteria (the most common situation), or the same infection that was never fully cleared.^9,4

How Vets Investigate Recurrent UTIs

• Urine culture from a sample taken straight from the bladder, to identify the bacteria and the right antibiotic^1,11
• A careful exam, including the vulva in females and the prostate in males^5,1
• Blood tests for diabetes, Cushing's disease and kidney disease^12,10
• Imaging: X-rays and ultrasound to look for stones, tumors and anatomical problems, and sometimes cystoscopy (a camera into the bladder)^1,10

Recurrent UTIs can be a warning sign of bladder cancer, so they're worth investigating fully.¹³

Treatment and Prevention

• Treat the underlying cause: control diabetes or Cushing's, remove stones, and manage incontinence.^1,3
• Vulvoplasty for a recessed vulva: surgery to remove the extra skin folds. In one study, 16 of 19 dogs with chronic UTIs (84%) had no further UTIs after surgery. Keeping a healthy weight afterward helps it last.^14,7,5
• Weight loss for overweight dogs, which can reduce skin folds around the vulva^5,6
• Culture-guided antibiotics for each infection. Longer courses may be used for persistent infections.^1,2
• Neutering may be recommended for intact males with prostate infection.¹

Long-term preventive antibiotics aren't recommended by international guidelines, because they promote resistant bacteria.¹ Evidence for cranberry, D-mannose and other supplements is weak; there's little evidence for oral probiotics.^1,2,15 Ask your vet before trying them. Bacteria in the urine without any symptoms usually shouldn't be treated.^1,3

Everyday Steps That Help

• Keep fresh water available and feed some moist food to dilute the urine.¹²
• Offer frequent bathroom breaks.^10,16
• Keep the area around the vulva clean and dry; your vet may suggest medicated wipes.^6,16
• Keep your dog lean.^5,7

Frequently Asked Questions

Why does my dog's UTI keep coming back?

Usually because of an underlying cause, such as a recessed vulva, bladder stones, diabetes, Cushing's disease, incontinence or a prostate problem, or because the bacteria weren't fully cleared. Ask your vet about a urine culture and further tests.

What counts as recurrent UTIs in dogs?

Three or more infections in 12 months, two or more in 6 months, or a repeat infection within 3 months of the last one.

Why won't my dog's UTI clear up?

The bacteria may be resistant to the antibiotic, or something such as a stone, tumor or anatomical problem may be keeping the infection going. A urine culture and imaging can help find the reason.

What can I give my dog to prevent UTIs?

Plenty of water, frequent bathroom breaks, a healthy weight and good hygiene help most. Supplements such as cranberry haven't been shown to work. Long-term antibiotics aren't recommended for prevention.

Can recurrent UTIs be a sign of cancer?

Sometimes. Bladder cancer can cause repeated UTI-like signs, so dogs with recurring problems should be investigated with imaging.

Does surgery help a dog with a recessed vulva?

Often. Vulvoplasty removes the skin folds that trap bacteria and, in one study, eliminated chronic UTIs in most dogs.