Different meanings
Blunt force trauma could mean different things. Typically, you would think a "hit" with an object. However, it could also refer to an "attack". Whatever the cause, it was sufficient to cause damage. I suspect the dog was attacked by something. From the description you indicating there seems to be bite marks with the ears and such.
Dog's skin is different than humans. It doesn't have the same "make-up" as humans. First, it lacks sweat glands. I believe the blood supply is also carried slightly differently to the skin. That means that often times cuts or abrasions on a dog will not heal up properly or stay open. They don't form the same type of scar tissue humans form when cuts heal.
The death of the skin isn't surprising. It shows a loss of blood flow to the area. Without this blood flow wounds can NOT heal. The dog sounds like it will take lot's of time to heal up. The wounds will need to be kept VERY clean and dressings changed often. However, there will be some scaring in the end.
Scooby, Shaggy the "Dogs", Ms. Thang the "Cat" and introducing Measley Weasle "The Ferret".
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