I have a 6 month old male Belgian Malinois. My fiancé and I have bought him many toys but can't seem to find one that last. He has chewed through Jwow ball, working on his second Kong Tugga Wubba (he chews the ends off). Anything that has a rope on it is usually chewed through in a matter of days. Anyone have any suggestions of a good and durable chew toy?