As a cat lover, you've seen play aggression in cats, and you have the scratches to prove it. You may sometimes wonder: Is my cat too aggressive?
Cat play looks like aggression. After all, cats use teeth and claws to subdue toys and playmates — and your ankles. Sometimes innocent roughhousing crosses the line into aggression. Fun and games for them can turn dangerous, even when your cat means no harm. Learn how to identify different types of aggression in cats and how to keep their sharp parts from causing injury.

Kittens play to learn how to interact with their world, other cats and people. They also play to practice skills needed in adulthood, such as hunting. Activity keeps cats of all ages fit, and play relieves stress and burns energy.
Kittens play at 4 weeks old. Techniques include object manipulation and social games with other cats and humans. Here are some common ways that cats play
Social play peaks at about 3 months of age. Cats aged 4 to 9 months focus more on hunting games. Adult cats continue to play but often with less intensity.

While dogs vocalize during play, cats stay silent. Even silent kitten play gets too rough when babies haven't learned how to pull their punches. So, is my cat aggressive? With older cats, when silent cat play turns noisy, you won't have to ask.
According to the ASPCA, "Aggression is threatening or harmful behavior directed toward a person, another cat or other animals." You may see one or a combination of the following:
Aggressive vocalizations include:
As you can see, the lines can be blurry between normal play and aggression. Pay attention to vocal cues to determine when play has crossed the line.