Green is a revolutionary way to turn your dog's meal into a challenging game. Many dogs lack mental stimulation which can lead to boredom and unwanted behaviors such as inappropriate chewing or barking. By entertaining your dog with their own food allowance you can stimulate them mentally and help to remove these problems. Just scatter the desired amount of food across the Green and watch your dog 'work' to push the food out between the many blades of grass. it is made of hard plastic (without phthalates) and can therefore be used both indoors and out and is also completely safe to be cleaned in the dishwasher.