There are three common types of guinea pigs: American, Abyssinian and Peruvian. The American guinea pig has short hair and a smooth coat. The Abyssinian guinea pig also has short hair, but the hair swirls in what is known as rosettes. The Peruvian guinea pig, or long-haired guinea pig, is my favorite. All three types come in a variety of colors and color combinations.
Adult guinea pigs are approximately 10 inches long and weigh 2 to 3 pounds. They have no visible tail. Guinea pigs generally live 5 to 7 years, so having a guinea pig, like any pet, is a commitment.