Changes in urination are common in dogs and cats and can range from mild irritation to a life-threatening emergency. Urinary problems may involve the bladder, urethra, kidneys, or other parts of the urinary system, and similar symptoms can occur with very different conditions.
Urinary tract infections, bladder inflammation, crystals or stones, urinary obstruction, kidney disease, and diabetes can all change how often, how much, or where a pet urinates. Because urinary symptoms tell us something is wrong—but not necessarily what is causing it—testing a urine sample is often an important part of determining the next step.
Urinary Infections vs. Feline Lower Urinary Tract Disease
Bacterial UTIs are more common in dogs than cats. Symptoms alone cannot confirm a bacterial infection; urinalysis and urine culture help determine if bacteria are present.
FLUTD (Feline Lower Urinary Tract Disease) deserves special mention. Urinary symptoms in cats are not automatically caused by a UTI. Many cats suffer from sterile inflammation (feline idiopathic cystitis), stones, or stress-related urinary issues where antibiotics are not the solution.
Urinary Obstruction — An Emergency
A urinary obstruction occurs when urine cannot leave the bladder normally. This is particularly important in male cats, whose narrow urethra makes them highly susceptible. A blocked cat may repeatedly enter the litter box and strain, causing owners to mistakenly believe the cat is constipated.
If you see repeated straining with little or no urine produced, crying, or vomiting, treat it as an emergency. A complete urinary obstruction can rapidly cause dangerous electrolyte abnormalities, kidney injury, and death without immediate treatment.