Guinea pig varieties found in pet stores are the English shorthair (also known as the American), which have a short, smooth coat, and the Abyssinian, whose coat is ruffled with cowlicks, or rosettes. Also popular among breeders are the Peruvian and the Sheltie (or Silkie), both straight longhair breeds, and the Texel, a curly longhair. Grooming of guinea pigs is primarily accomplished using combs or brushes. Shorthair breeds are typically brushed weekly, while longhair breeds may require daily grooming. Cavy clubs and associations dedicated to the showing and breeding of guinea pigs have been established worldwide. The American Cavy Breeders Association, an
Rock cavy Rock cavy The rock cavy or mocó ("Kerodon rupestris") is a cavy species endemic to eastern Brazil, from eastern Piauí state to Minas Gerais state. It has been introduced to the oceanic island of Fernando de Noronha. The rock cavy is a fairly large rodent weighing up to , and like other species of cavies the tail is vestigial or absent. The dorsum is grey and the venter light brown. They are hystricomorphs, which means they have porcupine-like jaw muscles. The rock cavy belongs to the order Rodentia and the family Caviidae. This group has two subfamilies: Dolichotinae and Caviinae.