Actually up to a weight for weight match or even more in the case of lighter humans, a single dog is trivial to defeat in combat unless it is properly trained to never fully engage and only to tear and dash.
If a person reacts aggressively and not trying to escape, a dog is easily defeated. Just have to protect your throat and keep facing the dog. Allow it to grab you on a limb , preferably a hand or arm, and you have control. Humans have three mouths , dogs only one. Force your hand / arm into the dogs mouth and do not pull away. Use the other hand to control the snout and remove the eyes. Use your mouth to destroy the snout and associated bone structure. If you can get your hand into the mouth reach for the lungs and asphyxiate the animal. Two Dogs gets tricky. Three dogs is deadly.
If a person reacts aggressively and not trying to escape, a dog is easily defeated. Just have to protect your throat and keep facing the dog. Allow it to grab you on a limb , preferably a hand or arm, and you have control. Humans have three mouths , dogs only one. Force your hand / arm into the dogs mouth and do not pull away. Use the other hand to control the snout and remove the eyes. Use your mouth to destroy the snout and associated bone structure. If you can get your hand into the mouth reach for the lungs and asphyxiate the animal. Two Dogs gets tricky. Three dogs is deadly.