At the very least, it should let your small pet move around and rest comfortably inside. Some small animals are more social, like guinea pigs, and may need enough room for two or more to cuddle inside. If that’s the case for your guinea pigs, make sure you purchase a large enough hideout that allows for your piggies to snuggle together. You may also need to purchase a second hideout in case they prefer to have some alone time as well.