Western coyotes are a lot smaller than those that are moving down the eastern seacoast. The coyotes we had in the San Gabriel mountains above LA,CA were about half the size of one coyote I saw at a remote sight in the Savannah River Site here in South Carolina. The DNA of coyotes here show they interbreed with Canadian wolves as they moved across North America dn down the eastern seaboard.
Living in the mountains for nine years I got to see a lot of coyotes. They would kill domestic dogs by leading them of into an ambush with their buddies. But they are not going to risk getting hurt, they hunt to eat and only fight to survive.
Our dog buffalo was really big, way more than 100 pounds and fearless, I heard him jump a lone coyote one night. That said, one time he disappeared for three days, we thought he was dead. He got back to the house, he was hungry, thirsty, and not hurt, but he was nervous as hell. He was constantly looking behind himself and around. Something put the fear into him and he never took off again, well, except to knock up the neighbors dogs.