RUBBER MATERIAL: HIPPIH treat dispensing dog ball is made of extra-tough rubber with good elasticity, good for your sweet dog grinding and fresh their teeth. ( Blue color-2.75 in, Green color-3.14 in, suitable for medium and large dogs. Not suitable for miniature small dogs, such as Yorkshire Maltese, etc) NOTE: The dog puzzle ball must be wider than your dog's mouth | STRONG TOOTH: HIPPIH blue dog ball can effectively help strong their teeth and won't hurt pets gums. The green one can put the food in to improve the interest of your cute dogs. | IMPROVE INTELLIGENCE & IQ TRAINING: HIPPIH dog toy ball can easily attract your pet's attention, help pets intelligence improving and is convenient to train dogs. HIPPIH dog ball toys are perfect for interaction with your dog, promoting the bond between you and your dog. | FOR AMUSEMENT: Perfect for fetch and interaction with your dog. You can add food or treats into the grooves and this keeps your dog entertained and active. HIPPIH IQ treat ball allow you have more interactive fun with your pets. | BEST GIFT FOR PETS: HIPPIH dog toys ball can reduce the dog's destructive behavior, protect the home shoes, socks, sheets, sofa are not afraid of dog bite. Your naughty active dogs will be love it to kill the boring time. This dog rubber ball is best gift for your sweet dog. | EASY TO USE: You can use dry food, wet food or peanut butter to put in the gap of the green dog tooth ball (the size of the dog food is preferably 0.2-0.6in); you can also use dry food to put on the blue treat dispensing ball. When your dog chases the blue treat ball, the food will slowly fall out to attract your dog's attention (the size of the food is preferably 0.5-0.8in).