TL;DR: House soiling is usually a cat's way of communicating medical discomfort or environmental stress; however, if your cat is straining to urinate without success, it is a life-threatening emergency.
What is cat house soiling and why is my cat doing it?
House soiling occurs when a cat that was previously litter box trained begins urinating or defecating in areas outside of their designated box. This is rarely a sign of 'spite.' Instead, it is typically a communication tool used by your cat to indicate physical discomfort, environmental stress, or dissatisfaction with the litter box itself.
When is my cat's house soiling considered a medical emergency?
- Medium Urgency: House soiling is often the first sign of medical issues such as Urinary Tract Infections (UTIs), Feline Lower Urinary Tract Disease (FLUTD), or kidney issues, though it can also be a behavioral response to stress.
- High Emergency: If your cat is straining to urinate and nothing is coming out, this is a life-threatening blockage that requires immediate veterinary intervention.
How can providing a photo of the accident help with triage?
- Identify medical signs: A photo of the urine color (checking for blood or cloudiness) or stool consistency helps your vet differentiate between an infection and a behavioral issue.
- Determine the cause: Seeing the location of the accident helps the vet understand if the cat is "marking" vertical surfaces or is unable to reach the box in time due to mobility issues like arthritis.
Clinical Context (Merck Veterinary Manual)
When addressing feline house soiling, a thorough behavioral history is paramount for diagnosis, prognosis, and treatment planning. Key historical aspects include differentiation between urine and feces, whether urine deposits are vertical (spraying) or horizontal (soiling), problem duration and frequency, signalment and temperament of the cat, elimination timing and location, detailed litter box information (number, placement, cleaning, substrate, size), the cat's daily routine, and its home environment. Treatment involves providing an appealing litter, box, and location, reducing access to previously soiled locations, and resolving underlying contributing factors. Appeal can be improved by identifying and resolving deterrents (e.g., undesirable location, fear-evoking stimuli, limited access), adding litter boxes, improving litter access, and determining the cat's preferred litter and box type by offering choices. If medical problems are excluded or treated, focus should shift to the behavioral aspects of avoidance related to the substrate, box, or location, or unpleasant experiences associated with the litter box.
Chapter: Behavioral Medicine
Source: The Merck Veterinary Manual, 11th Edition (Page 1572)