Oh, dear, Icebreaker....

I have a very chew-oriented dog, and he loves the Kong "Goodie Ships". You can stuff cheese or training sausage or peanut butter, etc into the holes and it keeps the beasties busy for a loooooong time. http://www.amazon.com/Dog-Toys-Kong-.../dp/B000H4F9KU

Another good trick is to take a regular Kong and wrap aluminum foil over the bottom little hole. Fill it with yogurt and dog food and freeze it. When you leave the house in the morning the gradually melting yogurt keeps the dog busy for a good half hour or so. (at least it keeps my dog busy)

I also have the Dental kong stick thing, and you can jam peanut butter or cheese into the grooves on it. My dog isn't so interested in the stick, though.