Yes. When I was a teenager I was helping my neighbor (with her toddler) deliver crystal from a party that she had had. The woman was outside when we drove up and told us to come on in. So the toddler got out of the car to play with her little dogs who were in the driveway and I got out after him while his mother reached back for the crystal.
What the homeowner didn't realize was that her DH was in the backyard with their German Shepherd, moving the dog from one chain to another. The dog heard us and broke away. He came charging up from nowhere and grabbed the toddler by the head. The female owner tried to stop the dog, but he threw her aside. I grabbed the toddler and threw him in the car.
The dog grabbed me by the hip and pulled me down on the ground. He was gnawing on the back of my neck when the male owner finally pulled him off. But it was worth it because the baby was okay.