I’m all about choices. I love being outside myself, even in the weather. The caveat being that I can come in when I’m ready to. I suppose one could call it anthropomorphizing but I’m not ok with a horse not having the option to get out of the rain, particularly when accompanied by fierce winter winds.
Another aspect is that our little herd likes to have a morning and/or afternoon nap. Where is that supposed to happen in inclement weather when they don’t have a soft dry spot to drop down on and snooze?
Anecdotal story:
Our horses are kept at home un-blanketed year round with large, hilly treed turnouts and run-ins if they so choose. Seems to me they mostly elect to be out but as per the poop piles those shelters do get used.
One cold rainy fall they were both sent to be boarded for a month in the local area so that we could get on with a project here. They spent their days out in a lovely pasture with some tree breaks…but no shelter, then in at night. I assumed they’d be fine as did the stable owner, considering they were naturally well insulated from years of outdoor living.
They appeared to like the place and settled in nicely. Two weeks in we had a stretch of bad weather and although pretty stoic about it they were miserable as hell, which being so familiar with their day to day vibe was not hard to pick up on.
We brought them home and the lesson I learned from that is yes, they are inclined to choose being outside for the most part but do count on having a spot to rest, dry off and hang out in when they’ve had enough. Some might argue that this is because they were accustomed to having a shelter and given time would grow used to not having one. I prefer not to second guess that scenario.