Does anyone have a dog with a bite history? An as yet unrealized threat to bite?

[livetohike]

2. Murphy (our ACD) bit me on the face in Feb. resulting in 8 stitches

You and the group helped me out so much during that trauma. He has not bitten me or anyone else since. We live out in the woods and he has little contact with people and zero contact with other dogs (besides our Catahoula Leopard Cindy). Cindy doesn't have a mean, nasty bone in her body despite her breed's reputation for aggressiveness. He has never bitten her.

Murphy is 9.5 years old and had never bitten anyone prior to the incident in Feb. I still can't figure out why he bit me. When we lived in a neighborhood for his first 4 years of life, he had contact with people and other dogs and while he wasn't the friendliest of creatures (he always barked at others), he never bit or even growled at anyone.

I am of no help in giving advice, since I am still perplexed with my own situation. I've had dogs my whole life(I'm 60 years old now) and never had one like this.