Our male cat was neutered as a kitten, I can't remember exactly how old he was but we had it done as young as was allowed. He's two and a bit now and a couple of months ago we spotted him spraying outside for the first time, he's carried on. This morning he did it inside Luckily it was on a washable surface.
I phoned the vet and they want to check he doesn't have a UTI, so I'm going to have to collect a sample . TBH I doubt it is a UTI.
I'm pretty much certain he's not done it inside before, I've certainly never seen or smelt any evidence. I really can't be doing with a cat-pissey house, has anyone got any tips or tricks for stopping him?