Animal bites can lead to infection and other complications, so immediate treatment is essential. Dogs, cats, raccoons, and bats are just a few of the animals that can bite people and cause infections. Cat bites are not as common as dog bites, but their long, sharp teeth can penetrate the skin more than dog teeth. Seek treatment for any bite that breaks the skin, especially if it is on the hands or fingers. If you have diabetes, a weakened immune system, or peripheral artery disease, it is especially important to seek treatment. These conditions increase the risk of infection for anyone bitten by an animal.