Purchase a wire cage. The guinea pig, also known as a cavy, has no relation to a barnyard pig. No one really knows why the word pig is in its name, as this small mammal is really a rodent. These quiet, docile animals make great pets, especially for owners who live in tight quarters. They do not mind being held and very rarely bite.
Guinea pigs can have either short or long hair.
Appearance is the only real difference between these two varieties. Against popular convention, it really is not safe to contain your guinea pig in an aquarium. These creatures need a lot of air and ventilation. A much better choice would be to purchase a wire cage and line the bottom with absorbent wood shavings. Like the rabbit, the guinea pig needs to be able to chew on wood to help curtail the growth of their front teeth.