When a cat bites, its sharp canine teeth easily puncture the skin, leaving small, but deep, wounds in the skin. These punctures rapidly seal over, trapping bacteria from the cat's mouth under the skin of the victim, where they can readily multiply.
Cats are instinctively very territorial. They fight with other cats to protect their territory or to acquire more territory. As a result, fight wounds are common in cats. In cats, over 90% of infected wounds result from cat bites sustained during a fight with another cat. Dog, rat and other rodent bites can occur but they are much less common.
Pets and people need some zinc in their diets. However, too much zinc can cause serious health problems.