Instruct: Classify Amazon reviews into positive or negative sentiment
Query: durable and useful

A great idea for getting the dog to focus on something when you need that. If your dog tends to beg at the table, give out one of these during you dinner time. Even though my two 20lb dogs are extreme power chewers they have left the kongs alone in that respect. The only negative comment I have is that soaking them in soapy water for cleaning tends to break down the material. I softens it a little bit so that it becomes slightly sticky.