I'm sorry for your loss. My very friendly red sexlink was taken last year by the neighbor's husky. And a few weeks ago one of the beagles we adopted took my EE pullet when he got out of the kennel. Our hens free range and every day when I get home from work I worry until I see them running through the yard. I know it would be safest to keep them in the coop, but they get so upset if they can't explore, it's the risk we take for free ranged birds. With my indoor dogs (both of which are high prey drive herding breeds) I decided to utilize and e-collar to teach chicken deterrent. I don't advocate the use of a shock collar to fix all behavioral problems with dogs, but in cases like this where there is absolutely no flexibility with the rules, I'd much rather my guys be afraid to go near the hens than to look at them like a squeak toy. It only took a few times for them to get the idea that chickens aren't toys.