My dog is an agressive chewer. He has destroyed many things, from (his and kids) toys to my wall. I have spent a lot of money on toys and so far (I bought the kong 1 year ago) he hasn't been able to destroy the KONG.  Thats a record for him. I got some advice from the S.P.C.A., they suggested the Kong and said you can buy the kong treats at the pet store or go to the dollar store and buy the squirt cheese to put inside. "Tastes gross to people but dogs love it she said." What I did, since my dog has allergies, is gave it to him once and waited for about a weak to see if there was a reaction....