Here's my shepherd mix, Honey.
We don't know how old she is, probably somewhere around 7 or 8.
We adopted her after our 6-month old puppy, who we had for a week before finding out she had gotten parvo from the pound, had to be put down.
Honey was used as a "bait" dog for dog fights. She's scared of everything, including my dad (she's pretty good around him when she's outside, though), and shakes like crazy every time he comes near her. She is scared of most people, and will attack anyone that comes in the door. You're not allowed to move until she sniffs you, she'll snap if you make the slightest move. She hates most other dogs.
I couldn't find a good picture of her scars, but she has them all over her face and legs, and two big chunks of fur missing from her shoulder and neck. We discovered a few years after we got her that she has the letter A carved into one of her ears. I'm not sure how noticeable it is in the picture, but if you look closely at the inside of her ear you can see it.
She doesn't like very many people, but once you get on her good side she is the sweetest thing!