"I have 2 Black Labrador Retrievers who love to chew, and I had purchased the Extreme Kong in hopes that it would occupy them for at least an hour. I filled the Kong with Peanut Butter, and they do enjoy that, but it only lasts about 30 minutes of licking enjoyment. Once they are done with obtaining the peanut butter, they do not find interest in the toy itself. The Kong lies on the floor until it has peanut butter in it again. The Kong came with a sample liver treat, but after about 2 weeks, it is still in there. I am not sure if they do not like the smell of the Kong or if it is another reason, but they do not seem to enjoy it that much. It is a good holder for 30 minutes of peanut butter licking time."