I think I had seen the same show as TreeRat did. There was to dogs and they would runs out in this field and start barking and making noise. In no time four coyotes can running out of some scrub. The dogs woould keep barking but they would slowly walk back to the shooter's. The shooter's took their time, cause the dogs keep the yotes occupied. Four dead yotes. I think the dogs where a black lab and a yellow lab. I'm positive any dog bigger then a coyote would work fine.