It all depends on the coyotes motivation If they are hungry and hunting dog meat if their are enough of them no dog could survive now if they are defending they are looking to drive the intuder out like this video they could wear this wolf down & kill him or he could just kill one of the adults and eat but he wanted the pups if their were less coyotes the pups would be gone http://www.youtube.com/watch?v=9hFtDCgzKLM&feature=related Coyotes Defend Their Den From a Wolf he comes back to the den in part two but they stopped filming. I got this hunting video "Coyote Hunting Is Going To The Dogs" where they use two cur dogs to bait and draw the coyotes so they can shoot them the curs get a bite in the ass once and a while but usually stay ahead 10 or 20 paces and will circle back to get them to follow if they don't come close enough they start by getting the dogs to bark while using coyote calls to bring them in the area. And many dogs can kill a coyote in prey drive most coyotes will run away if there aren't many of them or not that hungry.