My 3 year old brother and sister cats are suddenly fighting

by Susan
(Windsor, ON)

My 2 cats, one male, one female, both fixed, have begun fighting. Originally it was one a month, mainly at night, but has now progressed to almost daily. Their tails get puffy and the hissing, screeching and growling is very disturbing. They are swatting each other and showing their teeth, which has become somewhat frightening. Any ideas how to make them stop?


Dear Susan,

Cat aggression is a topic covered frequently throughout this site. There are many things you can do to help address cat behavior problems and cat fighting, most of which are addressed in this question and answer from another reader regarding Fighting Cats. Rest assured, you are not alone, and there are many ways to help your kitties get along again!

Best wishes,
Dr. Neely