You choose a box for your dog's size; toy, small, medium or large. I have a "small" dog & let them know he is a heavy chewer so they adjusted his box accordingly. Last month he received 3 toys(1 crackle/squeaker, 1 squeaker, & 1 squeaker/crinkle), 2 bags of treats(8-10 oz organic treats), 1 duck jerky chew, & 1 crunchy rabbit chew(large chew which I broke into 3 separate treats for special occasions). His next box is due any day now & only 1 toy has bitten the dust, which is a miracle for my little chewing man. This box saves me from making numerous trips to the pet store to stock up on chew toys or treats! LOVE IT!