On December 14, 2012: I just opened this Kong and was pretty disappointed. The holes on the ends that I was planning to stuff treats into are too large. The treats fall right out. Maybe this is meant more as a chew toy than a toy to stuff with treats though, in that case it would be great. Unfortunately, my dogs do not chew on toys (only food, paper, and furniture!). I will try to put some peanut butter in the ridges to see if that will get them more interested.