One can determine if a guinea pig wants to mate by observing its behavior alone and in the presence of the opposite sex. Female guinea pigs may act restless and anxious when mating season arrives. The male guinea pig typically tries to mount a female repeatedly when he recognizes that she is in heat.
A guinea pig owner often wants to control the breeding of his pets, so being able to identify when the animals are in heat is useful. The membrane covering the vaginal area opens to prepare for the mating process when the female guinea pig is in heat, and it closes back over after the need to mate passes. Male guinea pigs demonstrate a strong desire to mount the female guinea pig when she is in heat.
Another way to find out if a guinea pig is ready to mate is to place two guinea pigs of the opposite sex in the same cage with each other. If the guinea pigs are ready to mate, they will try to do so. To prevent a guinea pig from becoming pregnant, it's important to keep her away from male guinea pigs while in heat; otherwise, the animals may copulate. The female guinea pig typically goes in and out of heat every few weeks for up to two days, making it crucial to keep an eye on these pets around unneutered, male guinea pigs.