This is what I tell all of our customers. The picture below is a great example of what I'm talking about. Rabbits can do this to a tree when the snow is deeper than your trunk guards. It's the worst kind of surprise in the spring. We will additionally put a 5' cage of welded wire around the tree to keep rabbits and deer off of our trees. Nobody wants to make big investments of time and money in cider apple trees, heirloom apple trees or any apple trees to see this kind of damage happen. Protect your apple trees.
Check out the bridge grafts to try and save the 10 year old tree. I'm impressed with my friend Brian's grafting skills.