"I went through the medium sized version of this product with two dogs. My German Shepherd wouldn't go near it. She didn't like the way it bounced, she didn't like the way it rolled, and she certainly didn't like the feel of it in her mouth. She refused to ever pick it up. My Hound Mix rolled it around and managed to pick it up a few times, but always dropped it immediately. No matter what we tried, the toy was simply not stimulating enough for either of our dogs.
We still have the toy, and it's held up well. But I feel it's unfair to say as such given two of my dogs wouldn't touch it. Though, my friend has a Pomeranian who adores the tiny version. I suppose it's just a personal inclination for the dog."