The GREEN Interactive Feeder is designed to look like the grass outdoors. Simply scatter the desired amount of food and let your dog push the food between the blades to eat them. Not only does it turn food time into a game, but it also slows the amount of time it takes for your dog to properly digest food! This means a happier, healthier dog. GREEN is available in one size and is made from durable plastic. It can be used for any size or breed of dog. The design and material used allow for indoor or outdoor usage as well as being dishwasher safe!