This is a fantastic feline foraging toy! Traditionally a dog toy, it really seems geared more towards cats as most dogs would destroy this product. It comes with two sets of interchangeable lids, a set with one large hole and another set with three small holes. The holes can be taped up with scotch tape once your cat has mastered the concept to increase the challenge level. Large marbles can also be placed inside to add weight and obstruct the opening from time to time to make the toy much more difficult once your cats gets the hang of it.