Causes can include:Bladder Stones in Cats Bladder Stones in Dogs Lower Urinary Tract Disease in Cats Urinary Tract Infections in Dogs The Vet Files: Why Is My Cat Suddenly Peeing on the Floor? Urinary Incontinence in Dogs Hematuria: Blood in Urine of Dogs and Cats Bacterial Cystitis in Cats Transitional Cell Carcinoma (TCC) in Dogs Feline Urethral Obstruction: Why is My Cat Licking Down There? Why Is My Dog Suddenly Peeing on the Floor? Why Does My Vet Want a Urine Sample from My Dog? Could Surgery Help Your Dog’s Chronic Bladder Infections? Blood in Cat Urine: What Does it Mean?