We used to buy the "bouncy balls" - you know, the big, 10-inch or so ones for kids, but our St. Bernard of that time, Freckles, would be sooo joyful when playing with them, but so totally dejected when she (inevitably) popped them! She would be startled by the noise, but then try and nose it, flip it with her nose or paw, but it was "dead," and she'd be so so so sad, we stopped buying them even for ourselves!