Have you ever wondered why your two cats might not get along (assuming you have two cats)? Well, this might be because one cat doesn’t favor company. Cats who are not used to being with others might be suspicious and probably attack out of fear or anger towards the other cat. One cat also might want to want to hog you (you can consider that a compliment if you want). Now, if they are play-fighting, it’s ok, and to figure out which is which, in play fighting their ears and body lean forward. A female cat who has not been spayed that has already had or about to have kittens might be aggressive because she is a little overprotective of her unborn or newborn kitten(s). This aggression usually fades away over time as the kitten grows to a respectable age.