"I bought this product for my dwarf hamster, Maxwell. At first he didn't really like it. He hit it with his paws and in his language, that means, "Get away from me!" After a while he was happy with it and slept with it. But he still chews on the igloo which is a sign that he's not quite satisfied. That was months ago. Now he occasionally sleeps in it. Now he sticks to sleeping under and on his running wheel holding a sunflower seed. I reccomend this to other owners of hamsters. But for ferrets, chinchillas, and rabbits, they might chew more of the igloo."