Try bigger bones - my puppy did the same thing with his kibble he would pretty much "inhale" his food, we got him bigger kibble and the problem stopped immeadeatly ... View related article.
I just did this with my puppy and he loves it. I took and old paper towel tube and put Scooby snacks and some of his other treats in it and cut a hole in the tube and he loves it! ... View related article.