Guinea pigs are docile animals, and rarely bite without cause. They tend to 'mouth' their owners while being held, just to see if you're edible! These are not hard bites, though, and don't hurt. ... If your pet bites you for real, it's because they're afraid of you.
What happens if a guinea pig bites you?
You need to pay attention if the guinea pig bite has caused some bleeding. Mostly, the bite tends to be a normal one which does not cause any harm. But if it causes bleeding then you need to address the situation with care. Wash the affected area with soap and let it dry.
How often do guinea pigs bite?
Guinea pigs are very gentle pets and if they are well cared for and happy they won't usually bite. However, there are occasions when they may gently nip or bite.