Great fun and exercise for your dog, keeps your dog entertained for hours, feeding and plays in an interactive way, and helps promote a healthy diet and activity. It makes a kind of duck’s quack sound while the dog is rolling it around, making it more exciting for the dog. The sound is made by air convection and magnetic influence, not by pressing. As long as convection is in the right direction, balls will be issued a kind of duck’s quack sound to attract dogs’ attention and interest. To entertain your dog whilst rewarding them at the time of play, your pet is not only stimulated mentally, trying to understand how to get the treats out of the ball, but also it keeps them entertained for as long as it takes them to get all the treats out.