It wasn't a raccoon, I guarantee it. I've hunted hounds on raccoons for years and killed them up to 40 pounds. Several of those larger coons, after shot would come out of the tree alive and a 70lb hound would handle them with ease. Granted he'd always get bit on the nose and face. Remember a dog's instincts is to go for the neck, it's bred in them and 1 on 1 fights will be face wounds. You're dog was attacked by a pack of coyotes in my opinion. Pack meaning 2-4 dogs. They'll lure your dog out and then play that wolf game with them. Seen it many times with friends that live further out except most of their dogs were Rotts and Chessy's.

I'll guarantee you a lab has all the instincts in the world to kill when cornered. I've watched my chocolate lab kick the [censored] out of 2 dogs a couple years ago. One of situations where you think you're going to have to shoot the others and you're dog pulls through with a few small rips and tears...

Time is your worst enemy, he's a tough dog and hopefully he's learned a lesson..

Gotta love a well trained lab, man's best friend!

Keith