American

The American, sometimes referred to as the "English" cavy, is the most common breed of guinea pig, as well as one of the oldest. The hair is short, smooth, straight, and sleek. It is found in a wide variety of colors and color combinations and has a Roman nose (wide and curving). Its body is medium length, and of about the same circumference from the shoulder back to the hip.

American Satin

The American Satin has the same appearance as the American, but the coat is fine, dense, and soft, with a glossy sheen, and feels like satin to the touch.

Abyssinian
The Abyssinian (Aby, or Abby) is one of the oldest breeds of guinea pigs. It is recognized by the symmetrical rosette (hair radiating symmetrically from a center) and erect ridge patterns on its body and head. The number of rosettes can vary, but to be shown, an Abby must have at least eight (10 are preferred), and they must be clearly defined. The Abyssinian also has a mustache of raised fur around its nose. The fur is coarse and is found in a multiple of colors and color combinations.