Is your cat fighting with other cats ?
Fighting with other cats is a common aggressive bad cat behavior. Cats tend to mark their territories. This can be noticed more when you have other people who own animals or those with allergies over at your house. When a cat notices this, he will rub his head against the person. In doing so, he will put a touch of saliva on the individual. In a cat’s mind, he owns what he puts his saliva on. Those of you who have an indoor cat should expect the cat to spend quite a bit of time lying near windows. As you can see, all sorts of cat behaviors are there and we can hardly predict them.What you need to do is to provide a sense of security to the cat by providing him more love and affection.