cat hissing and spraying

Question
My husband and I just got a cat that isn't neutered. Amazingly enough he (Chang) doesn't spray on anything in our house but always goes in his litter box. First question: should I still be worried? Will he only spray when he detects a female in heat or when he gets completely comfortable in the house? Second question: after he pees in the litter box, he walks around making weird noises, shaking his butt, his tail is puffed, and once time when i tried to pet him during this he hissed and batted at me. Why is this? I've always had fixed cats (and we're planning on fixing him VERY soon), but I'm just wondering about this behavior!
Thank you :)

Jenny

Answer
Jennifer,

You don't say how old the cat is but he may be young enough not to spray yet. Also, if there aren't any other male cats in the home to be territorial with he may not feel the need to 'mark his territory'. If a female in heat is detected, if he is old enough, and has the desire, that might all change! It's good that you are going to have him neutered.

The cat may have a urinary tract infection or urinary crystals which are very painful when they urinate so that is why he may be sensitive after he goes. If they cause a complete blockage they are usually fatal in a male cat. I would have the vet check him for it when you take him to be neutered.

Tabbi