1- Those Weird, Dilated eyes
2- Slinky Body Language
3- Doesn’t Like Beer
4- Ability To Fit Inside A Hole Smaller Than Their Own Diameter
5- Sleek Hair
6- Reluctantness
7- Gets In Fights Every Time You Leave Them Alone For One Second
8- Flickering Tail
9- Absolutely No Regard For Your Well-Being
10- Eats Cat Food
If you answerd yes to 6 or more, yes, they're definitely a cat.