Most Common Vet Visits: Bladder or Urinary Tract Infection

Urinary tract infections (UTIs) are among the most common health issues seen in both dogs and cats. A UTI occurs when bacteria — most often Escherichia coli — colonize the urinary tract, including the bladder and urethra. While UTIs are generally treatable, they cause significant discomfort and, if left unaddressed, can lead to more serious complications. Recognizing the signs, understanding diagnosis, and knowing when symptoms signal something more serious helps pet owners seek timely care.

Symptoms in Dogs vs. Cats

In dogs, UTI symptoms are often fairly obvious: urinating more frequently than usual, straining or crying during urination, producing only small amounts of urine, accidents indoors despite being house-trained, cloudy or blood-tinged urine, and excessive licking of the genital area.

Cats are more private about their discomfort, and feline lower urinary tract disease is a more complex picture. While bacterial UTIs do occur in cats — particularly older cats and those with diabetes or kidney disease — cats more commonly develop Feline Idiopathic Cystitis (FIC), which produces identical symptoms but is caused by stress and inflammation rather than infection. Signs include frequent trips to the litter box with little output, straining, vocalizing, blood-tinged urine, and urinating outside the box. A blocked bladder — a true emergency more common in male cats — causes complete inability to urinate and requires immediate veterinary attention.

Diagnosis: Urinalysis and Culture

The cornerstone of UTI diagnosis is a urinalysis, which examines urine for bacteria, white blood cells, red blood cells, crystals, and other indicators of urinary tract health. For a definitive bacterial diagnosis, a urine culture and sensitivity test identifies the specific bacteria present and determines which antibiotics will be most effective. This test takes a few days but is essential for ensuring the right antibiotic is prescribed. A sample collected by cystocentesis — a small needle through the abdominal wall directly into the bladder — provides the most accurate results, avoiding contamination from the urethra.

Treatment and Recurrence Prevention

Bacterial UTIs are typically treated with a course of antibiotics based on culture results, commonly ranging from 7 to 14 days. Completing the entire course — even when symptoms resolve early — prevents bacterial rebound and antibiotic resistance. A follow-up urinalysis after treatment confirms the infection has cleared. To reduce recurrence, encourage adequate water intake (which dilutes urine and flushes bacteria), feed wet food when possible, keep the perineal area clean, and ask your veterinarian about urinary health probiotics.

When UTI Symptoms Signal Something More Serious

Urinary symptoms don’t always mean a simple UTI. In both dogs and cats, struvite or calcium oxalate crystals — and fully formed bladder stones — cause identical symptoms. Crystals and stones irritate the bladder lining, predispose to infection, and can obstruct the urinary tract. Imaging (X-ray or ultrasound) is often necessary to detect stones. In cats, FIC requires a very different management approach focused on stress reduction and dietary modification. Older pets with recurrent urinary symptoms should also be evaluated for underlying conditions such as diabetes, Cushing’s disease, or kidney disease.

If your dog or cat is showing any signs of urinary discomfort, don’t wait to see if it resolves on its own. At Dunedin Animal Medical Center, serving Dunedin, FL and all of Pinellas County, our team is experienced in diagnosing and treating the full spectrum of urinary tract conditions — from simple infections to complex bladder stone cases. Reach out today to schedule an appointment and get your pet feeling comfortable again.