I agree with Schutz. I've just been adopted by a 5 to 8 yr old tom (we're not sure how old he is, but the vet & I have had a good guess!). He was un-neutered when he moved in but I had him "done" last week. Be assured, when you do have your wee lad done, the smell of tom-cat pee will be gone in about 3 or 4 days. He may still spray, but it won't pong! My dear little Monty (now, sadly, gone over the Rainbow Bridge) was neutered at 6 months, and although he still scent-marked (mainly outside, bless him!), there was no nasty 'niff! Get your wee man done as soon as you can, not only for the sake of your olfactory glands, but for the sake of him and all the local females whose owners can't be bothered to get them spayed!! Good luck, love, K x