Wild guess here from your photos it looks like some kind of old abcess. When that happens, the infection damages the surrounding skin which causes the hair to fall out, and damaged skin will slough off. If that is directly behind his shoulder, it could be from a vaccine, a microchip, or a bug or animal bite, or a thorn from a shrub could do it. Good thing is, when it's all healed up, I think the hair could grow back, it may just take a while. The old, damaged skin will slowly shed/slough off and new, healthy skin, will replace it. Depending on the amount of damage done will determine the amount of time it takes for the skin to recover. Like I said though, this is a wild guess.
Don't feel bad about not catching this sooner. Many of us have missed things going on with our pups. The important thing is that you did catch it, and you're doing the right thing by having it seen by a vet and a specialist. Lesson learned, you'll be a better mommy from now on because of this, and so will others on this site who read your story.
Waiting for an update! |