Just had a friend who lost all his hens, and runner ducks in one night do to a dog that got in his yard. Tragic. He loved them like we do. We have a collie, that protects ours. As a herding dog, it's natural for her. If she see's a turkey vulture, hawk, coyote, whatever, she goes into defense mode and keeps harm away. I've read about other dogs that do the same, that may be a good way to go. Sorry for your loss :-(