These photos were provided to me by Lisel Lockhart, SK Canada. She and her husband have a sheep operation and deal with heavy coyote predation...

They had some problems before the collars, after 0. They make a diffrence if you have the right number of dogs for your situation as they do, the collars will give your guardians a feeling security if you have had problems with predators. These folks have plenty of dogs with their sheep and cattle, and that makes the difference, I think also their dogs are fairly strong gaurdians.