This message answers to teach1rusl,
Well, I meant that chickens are more cold tolerant than us. So what I specifically meant is that we feel cold does not mean that they feel cold. I check my chickens everyday. Their combs, how they move, and etc. I don't think them as a pet, but they have got respect and are living with us. In this weather, they still go outside everyday, and roaming around because they choose.
Maybe I have to mention that my chickens are cold hardy breeds (rocks), and that's how they survived and thrived even when people were struggling to keep their own heat source (no electricity, no central heating, and etc), like long time ago... So chickens from warmer climate might not well adapt in North East. It is my mistake not to mention that last time. I am sorry about that.
Now I am talking about dog since you brought it up. Some are really cold hardy, and others are not. Siberian Huskies would not survive well in tropical environment. It does not mean that they don't need any shelter to live comfortably in harsh winter, but we know they are cold wether adapted dogs, while others would like to be in warmer climate. Other animals, for example, some fishes can live only in really cold water stream like trouts, while tropical fishes cannot live in that environment. And the trouts, which live in that cold water, which we can't imagine how we could survive in that environment, cannot survive in warm water, which we tend to think a better environment than really cold one...
I free range my chickens, so I don't want to create too different environment between an inside and outside of the coop. It seems to create a lot of stress to any organisms if the temperature changes, especially in a drastic way. As long as chickens have fresh dry air and draft free environment, they are usually ok. What they seem to hate is being locked up in the coop, since they are always ready to get out when I come to open the door for them.
Only we can find out what is likely best for animals by learning information and each of us observes and verifies the validity. Thanks for reading a long message.