It seems like my shepherd is going through nyla-bones insanely fast. The last one I bought him was the "indestructable big dog proof" galiao one and he had the ends chewed and shaved down within 3 days. I know nyla bone says the plastic pieces pass through their digestive tract fine, but I still feel uncomfortable about my dog eating plastic! Not to mention those things are expensive! I'm getting tired of paying almost 20 bucks for something that doesn't last even a week and claims to be 'indestructible'. Does anyone else have this problem with the nylabones? And does anyone have any other suggestions for a less expensive, relatively safe chew?