Ah, the classic conundrum where your beloved feline decides your couch is the most luxurious toilet they've ever seen. Before you surrender your sofa to the cat, let's play detective, because your cat isn't doing this out of spite; it's sending you a message, albeit a stinky one. First things first, book a trip to the vet. This is non-negotiable. Your cat could be dealing with a urinary tract infection, bladder stones, or other medical issues that make peeing painful. If it hurts to use the litter box, they'll start associating that pain with the box itself and seek a softer, less-painful alternative, like your chenille sectional.
Once your pet gets a clean bill of health, it's time to investigate the behavioral side of this fragrant crime. Think like a cat. Is the litter box a pristine palace, or has it been a bit neglected? Is it located in a scary, high-traffic area next to the roaring washing machine? Some cats are just particular about their bathroom arrangements. You might need to add another litter box following the sacred "one per cat, plus one extra" rule. You could also try different types of litter to see if your furry friend has developed a sudden aversion to their usual brand. Sometimes, a simple change of scenery or substrate for their business is all it takes.
Finally, you must make the couch the most unappealing pee-spot in the entire house. This starts with a deep clean, and not with just any old soap. You need an enzymatic cleaner, which is a special potion that breaks down and completely eliminates the urine proteins. If you don't, your cat's super-sniffer will still detect the "go here" sign you can't smell. After it's clean, make the couch temporarily inhospitable. Cover the cushions with plastic sheeting, aluminum foil, or anything that feels crinkly and unpleasant under their paws. You can also try a calming pheromone diffuser, like Feliway, to lower your cat's stress levels, which could be the root cause of the whole mess. With a little investigation and some tactical maneuvering, you can reclaim your couch from your tiny, furry dictator.
