When a cat with years of perfect litter habits starts leaving urine on walls and furniture, the order of your response matters more than any single step in it. Health first, detective work second, and punishment nowhere. A sudden change in a long-settled adult cat is exactly the pattern that can carry a physical cause, and treating it as a behavior problem for weeks before anyone checks can leave a painful condition unexamined. Work the steps in order and the cause usually surfaces in time, whether it turns out to be medical, environmental, or a mix of both.
Step One Is the Veterinarian
Book the vet check before changing anything else. Urinary pain, infection, crystals, and other illness sit on the list of possibilities a veterinarian investigates when a previously reliable cat starts urinating outside the box, and discomfort alone can rewrite a cat's relationship with the litter box. Bring observations, not guesses: when the marking started, how often it happens, and exactly what the cat's body does. Posture is the detail that helps most. A cat that stands, tail raised and quivering, and leaves a small amount of urine on a vertical surface is spraying. A cat that squats and empties fully, on a horizontal surface, is making a litter visit in the wrong place. Those are different problems with different causes, and telling the vet which one you saw saves real time.
Then Audit What Changed
Alongside the health check, walk the household for triggers, thinking about the weeks just before the first mark. A new pet is the classic one, but new furniture, a moved litter box, a changed work routine, building noise, or a strange cat appearing outside the window can all make a settled cat feel its territory needs re-stamping all over again. Even a new brand of litter or a covered box swapped for an open one counts as a change from the cat's side of things. Write down everything that changed, however minor it seems, because the trigger is often the item the household dismisses as too small to matter.
Log Marks, and Never Punish
Keep a plain log of every mark: where, when, and what was happening in the house around it. Patterns hide in logs that memory smooths away, such as marks only on days a particular neighbor's cat passes, or only near one door. Never punish the cat, not with shouting, not with rubbing a nose in anything, not with exile to another room. Punishment adds stress to a cat that is already marking because its world feels unstable, and stress is the fuel of the behavior you are trying to end. Clean each mark calmly as part of the routine, and let the log and the vet carry the investigation.
Put the Response on One Household Plan
A spraying problem gets worse when each person in the home responds differently, one logging and cleaning, another scolding, a third moving furniture in hope. Care Teams holds the household response plan for this change in one written place: everyone logs marks in the same format, the no-punishment rule stands for every person including guests, and the duties for each trigger fix, from securing a window blind to restoring a moved litter box, are assigned to named people with the vet visit itself tracked alongside. Kept beside the litter log, the Care Teams response sheet on KinsLe names who checks, who cleans, and which trigger each person owns.