Well, I have a German shepherd, And he knows how to open, BOTH of the Doors(One is a slide door, Than a door when you pull down Door nob, It opens, My dog can open both of the doors, He has scratched up BOTH of them so much, All of the paint is off, So i'd like to know if you have any idea how to get him to stop scratching the door? Any help would be great.

By the way hes 8 months old now. Hes very large already because the amount of wolf he has in him.