Our two year old male cat has started urinating in inappropriate places in our home. I have no idea what is going on with him. A couple of months ago, he urinated on our futon, and this evening, I caught him in the act, on the bed, while I was on the bed. He is usually a very laid back, well adjusted, happy go lucky cat, so I am very worried about what is going on. There wasn't any blood in the urine, and it was a large amount, so I don't think it is a UTI. I am worried because this isn't like him, and also because I don't want to have to continue to replace our bedding. Any thoughts/solutions?