Thanks for your responses to my post! I really appreciate all the good advice and good words.
Update: the stray husky ran down the street to a park where my kids were playing and acted strangely (running up to them, then growling and running away). They know better than to mess with a stray dog and headed straight home after encountering it. I called local Animal Control and they picked it up. Yesterday I called and AC gave me the owner's name, phone number and address. I live in suburban Los Angeles, so wouldn't have felt comfortable shooting the dog. Our houses are close together and neighbor's kids play in their backyards. Plus I just didn't have time... it ran into the backyard, jumped the fence, and got into the coop in minutes. I threw rocks at it trying to keep it away from the hens and it was running around the back yard really fast. I'm a good shot, but doubt I would have hit it anyway. I just feel lucky that I saw the dog run in the backyard and was able to save the rest of the chickens!
So now I'm screwing up the courage to call the owner. I live in a place with a lot of gang activity and hear gunshots regularly. So I'm wondering if it's worth it to contact the owner. I will kill the dog though if it comes back (and they are such a smart breed, so I imagine that's a real possibility). The coop is predator-proof (as long as the kids don't leave the gate open), but it still makes me nervous that the dog might come back. It's a shame because it's a really beautiful, young husky and the owner must have paid a lot for it. When we had a sweet German shepherd mutt we had to lock up the chickens because she'd go after them. That's just a predator's instinct. But irresponsible pet owners are another thing...
On a positive note, my sweet Red Sex Link survived the dog attack! I saw her in the husky's mouth, but I don't think it seriously damaged her. She was pretty traumatized, but is acting normal now and doesn't seem injured. Whew.
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