For the dog attack....if the other chickens aren't pecking on him, I would keep them together, less stress for him.
As to a good Alaskan coop, don't forget venting, and you might not need any heat lamp in the winter...where are you located? As in, arctic blasts? -70? Or that warm area down by Juno?
As to a good Alaskan coop, don't forget venting, and you might not need any heat lamp in the winter...where are you located? As in, arctic blasts? -70? Or that warm area down by Juno?