My hamster loves this. I’ve had many small animals including hamsters, rabbits, Guinea pigs, etc and these houses are GREAT for hamsters and mice. The bigger sizes are also great for rabbits, chinchillas, and rats. These give your fur baby a place to hide when it’s scared or stressed (which is great especially for hamsters bc they are easily frightened) and a place to sleep. Some rabbits won’t use these but others will adore them. Almost all hamsters will sleep/hide in these. Be aware that most small animals will teeth/chew on these (as they will most things) but it’s simply in their natural. My hamster sleeps in his EVERY day!