It may be hard to believe that a little creature like a guinea pig can be aggressive or capable of lashing out in anger.  However, your vet has most likely come in contact with various American guinea pig breeds and other breeds that present signs of aggression. It’s important to note that American guinea pigs are not born aggressive. Instead, they generally learn the behavior. Sometimes signs of aggression may take on habits such as biting, scratching, or fighting for food. If this happens in your American guinea pig call your vet as there could be something else going on with your cavy’s health. American guinea pigs are generally social animals that enjoy good company with others. He may show signs of aggression if he feels lonely or afraid. In this case, it may be a good idea to bring another guinea pig into the mix. Your veterinarian Myakka, FL may recommend a companion. Visit this website to know more.