I have this 5ft Orange Dream in a raised boarder. I noticed today that something appears to be Gnawing the bark off..could this squirrels? I live next to a park and have noticed some in my garden recently.. larger furry animals do not have access to my garden. You can see a small branch laying that seems to have been bitten off. Do you think this level of bark loss is terminal? Thoughts, experiences welcome Cheers Rich