UTI in Dogs: Symptoms, Causes and When It's Urgent

Urinary tract infections (UTIs) — also called cystitis — are one of the most common reasons dog owners visit the vet, especially with female dogs. The good news: if caught early, they're straightforward to treat. The risk: left untreated, a bladder infection can spread to the kidneys.

Signs of a UTI in dogs

• Urinating more frequently than usual — asking to go out constantly, or having accidents indoors in a previously house-trained dog
• Small amounts each time — straining but producing little urine
• Pain or discomfort when urinating — whimpering, crouching awkwardly, stopping mid-stream
• Blood in urine (haematuria) — pink, red or brown tinge. One of the clearest signs.
• Licking the genital area more than usual
• Urine with a strong or unusual smell
• Accidents in the house — not disobedience, inability to hold on

How urgent is it?

• Vet appointment within 24-48h: mild symptoms, dog is eating, drinking and not in obvious pain
• Same-day appointment: blood in urine, visible pain, loss of appetite
• Emergency vet now: dog repeatedly trying to urinate but producing nothing, especially in male dogs. This can indicate a urinary blockage — a life-threatening emergency

Why female dogs get UTIs more often

Female dogs have a shorter, wider urethra than males, making it easier for bacteria (usually E. coli) to travel from outside into the bladder. Spayed females also have higher rates of urinary incontinence (a weak urethral sphincter), which can be associated with recurrent infections.

In male dogs, UTIs are less common but often linked to prostate problems — especially in unneutered males over 5 years old.

What the vet will do

1. Urine sample: free-catch (from the ground as the dog urinates) or a sterile catheter/cystocentesis sample. Analysed for bacteria, white blood cells, blood and crystals.
2. Urine culture: for recurrent or severe infections, to identify the specific bacteria and which antibiotics will work.
3. Ultrasound: to check for bladder stones, thickened bladder wall, or kidney involvement.

Treatment

Standard treatment: a 7-14 day course of antibiotics. Critical: finish the full course, even if the dog seems better after 3 days. Stopping early allows resistant bacteria to survive and cause a harder-to-treat relapse.

Preventing recurrent UTIs

• Always have fresh water available — dilute urine is less hospitable to bacteria
• Regular toilet opportunities — don't make your dog hold on for hours
• Clean the genital area, especially in long-haired breeds
• If UTIs keep returning (3+ per year), ask for a urine culture before each treatment to detect antibiotic resistance

FAQs

Can I treat my dog's UTI at home without a vet?

No. Bacterial UTIs require antibiotics — they don't clear on their own and can spread to the kidneys if untreated. Supportive measures (more water, warmth) can help alongside treatment but don't replace it.

Can cranberry help dogs with UTIs?

Cranberry (D-mannose) may have mild preventive properties but the evidence in dogs is very limited. It's not a substitute for antibiotics in an active infection.

My dog has had 4 UTIs this year — is that normal?

No. Recurrent UTIs need proper investigation: urine culture, ultrasound, hormonal assessment in spayed females. There may be an underlying cause like bladder stones, anatomical abnormality or immune suppression.