Check out the Natural Balance brand foods. They may have what you are looking for.

Check this site out also...
http://www.dogfoodscoop.com/index.html

Make sure you get good training on how to use a shock collar if you use one. I'm not against them (we have an invisible fence) but you need to be careful in how you use it. You need to remember that the dog is going to associate the shock with what...

Is the dog actually 'chewing' on them or is it possibly just grooming them? My Anatolian grooms the other dogs in my house regularly.