Only two wood edges are accessible to the dog...both of which will be covered with 1/8" thick angled aluminum to prevent chewing on the wood. The rest of the wood is not accessible to the dog.

Also, the door would be better IMO if it was made out of one piece of 3/4" pressure treated plywood for a single piece making up box frame to mount the door. I will be making a couple more of these and will likely do them that way.

http://AmericanBandog.com