my brother got bit by our old dalmatian when he was kid, he ened up in AE. few stitches but badly brused, 20 times worse tha on that vid, if 3 yotes really attacked him he would be 100% worse than that or dead .!!
The wounds are not all that convincing. But I could see where his behavior might have put them off. Especially if they were looking for a dog, our perhaps a deer. They are not generally looking for a fight just a meal.
ATB