My Murphy did almost as much damage to himself during one evening - we were in the other room watching tv- it appears that he was bitten by a red ant and/or spider. Required extensive cleaning and antibiotics plus shaving - I was in disbelief but my vet said it is unbelievable what damage a dog can do to himself - anyway, Murphy healed - took care and cleaning and quite sometime. Not saying that this is what happened in this case but even I was insisting that he must have been bitten and his long fur hid it, etc.
Will donate to Southern Cross to help this guy.
Murphy, forever in my heart, 11/1/98-10/1/12; his BFF Allie, 5/12/05-2/7/16 and Ziggy (6 year old mixed Shepherd/Lab)