Does anyone have insight into which canine breeds make good predator protectors for the flock? I've been doing a lot research on how to introduce dogs to your flock, to act as guardians against predators. I'd also like to adopt a rescue from a local shelter. The question though, is that most shelters seem to have a lot of AmStafs or Staffordshire Bull Terriers, and not much else. And I'm wondering if their disposition will be compatible with the flock. Any insight of experience would be appreciated.