An 88-year old woman in Hamden, Connecticut heard a scratching at her door and let in her cat. Unknown to her, a raccoon followed her cat inside at the same time. Thinking the raccoon was her cat, this woman tried to pet it, causing the raccoon to attack her.
Be aware if you let your cat in and out on a regular basis, other animals could follow, especially if your cat has a cat door that gives it access to the outside world on its own. The last thing you want is to have wild animals barging into your home because owning a cat is bad enough on its own.