6. Uncovered poop
For most people, cats are a great pet because they pretty much clean up after themselves. But uncovered poo is usually an indication of an angry kitty. Did you recently show him dominance? This could be his treat to show you that he is, in fact, the dominant one in your relationship.
But, it can also be a sign of a medical issue, according to Vet Street. So if your cat continues to leave their poop uncovered, you might want to take them to the vet.
Next Up: Hissing