Race Description: Guinea pigs are large for rodents, weighing between 0.5 (as juveniles) and 1.5 kg (1-3 pounds), and measuring 25-40 cm (10-15 inches) long. They live an average of four to eight years. According to the 1997 Guinness Book of Records the longest living Guinea pig lived 15 years. They are social, living in the wild in small groups which consist of sows (females), a boar (male), and the young (which in a break with the preceding porcine nomenclature are called pups).