We have wild turkeys near us. My chocolate lab went a couple rounds with a mother turkey this spring. First couple of encounters went to the mama turkey as she was defending her babies and my dog was just terrified of her. She would spread her wings (6-8 feet wide or so?) and then hover above him. He would freak out and back away, terrified. Eventually the dog got brave, chased her off and ate a couple of turkey babies. But based on that interaction, I definitely would NOT bet on a lab taking down a velociraptor. The raptor would have gone for the kill when the dog was still scared..