The PetSafe Busy Buddy Magic Mushroom is a meal-dispensing dog toy that can be used instead of a traditional food bowl to slow fast eaters and help support weight management efforts. The base of the mushroom twists off to easily load or remove kibble and treats. Open the windows wide under the mushroom cap for faster dispensing, or close more tightly for more of a challenge. Works with a wide variety of food options. The M/L size is for dogs weighing over 20 pounds.