This how cats start a territorial fight..

Do you have two cats that aren’t getting along? There could be a multitude of reasons why your cats are fighting, and you need to find out why it’s happening before you can solve the problem. I will explain the various reasons why some cats don't get along with each other and offer solutions to help you bring peace to your household.

All cat fights are not the same. Sometimes what looks like a cat fight may actually be normal playing. This is more common with younger cats, but it can happen at any age. Cats will chase each other around the house, tackle each other, and fight like little wrestlers on the floor. It can sometimes get pretty intense, but, as long as they're not crying out in pain, there’s no need to break them up. They’re probably just having fun or trying to establish their rank in the household.