I'm new here, but do dog rescue, so I am going to chime in. First, I am really sorry for the loss of your chickens. I am sure they do become like pets; the first thing I say when asking what kind of chickens would work here is that I could never eat them.
Secondly, please don't blame the dog, or ask that he be put down. He was only doing what dogs do. Huskies, especially, are responsible for getting their own food in the north, so they are hunters. But very sweet dogs. Make the owners pay for your chickens, and ask they get a fine for the dog being loose. A hefty fine, so they take precautions to keep the dog under their control. I am only just starting the chicken-owning process, but with 9 dogs on my land, I know that I have to make sure the chickens are safe, and I am not sure how to do that, because dogs are smart and strong, and can get in many enclosures.
I hope your pain lessens and you can find it in your heart to forgive the dog for being a predator. He didn't even realize that he had done wrong.
Peace,
Nancy