Bojer is almost eight months and he will go in his crate freely at night and when we leav he will go in and we give him a nice morrow bone with chesse, he LOVES it, but right when the door closes and we are outside the apartment he becomes a wild crazy dog and trys everything possible to break out (which he has many times) we are now putting a lock on the crate because he is bending the handle to close the crate door. we tried leaving him out during the days but he will pee in the hosue and destroy things. We are worried that the constant clawing and biting the crate will hurt his teeth and nails. Any advice?