I know animals are not all the same....some horses like to be in the barn or run in when it's snowing, raining, windy, etc. and some don't. Some dogs will seek shelter in bad weather and some like to stay out in it. Same with chickens. Some deer will bed down in bad weather and some won't.
But they all have one thing in common...they have fur, down or feathers that are adequate for keeping them warm if a person allows them to develop that coat. If a horse is blanketed it may not develop a sufficient winter coat or if too old and skinny, not sufficient fat, if a pet stays inside or a chicken's coop is even mildly heated, it may not develop sufficient coat for withstanding the cold comfortably. All of these are variables, but the fact remains that they have fur or feathers on almost their entire body and we do not....common sense alone could get one to the place where they can see that animals are designed for outdoor living and we are not.
I don't think it's anything offensive or judgemental to safely say that animals~as a whole and I know there are exceptions for certain disabilities/mutations/illnesses, etc~belong outdoors. That doesn't dictate that everyone should keep them outdoors...that's your business, but they clearly belong out there. All their sensory capabilities, their instincts, their body design and diet all indicate a life lived out of the environment of a human's house.