My young buck will not eat wood- but will eat bricks, metal and plastic. Is it harmful for him not to knaw wood, and how do I stop him eating what he shouldn't? :huh:

It is really bad for him to eat bricks, metal, or plastic. At the least, he could hurt his teeth. At the worst, he could get a blockage in his digestive tract. Until he learns to not eat those things, try to keep him away from them. You can try spraying them with Bitter Apple spray. See http://www.rabbit.org for more ideas.

As for wood-like things that he can gnaw and should, I like to get Busy Bunny baskets and treats. See http://www.busybunny.com

All of my rabbits love paper and cardboard, so try giving him perhaps the inner roll of a toilet roll to chew on. Also, if you can't keep him away from things he shouldn't chew, spray them with something that smells strong and unpleasent, but won't harm him. My doe decided she liked a certain corner to chew on, until I sprayed it. She won't touch it now (thank goodness!)

Also, I find that although none of my bunnies will touch the apple tree branches they have, they WILL chew the legs of my desk. Whichy is fine, it needs replacing anyway, but I've put it down to the shape. They seem to like chewing corners...? Try actual blocks, if you haven't already.