Some horses cope just fine others do not.
One needs to ensure they look at each horse individually, this goes for everything when it comes to horses imo. What works for You and your horse may not work for someone else and their horses.
To me heat isn't so much an issue as arE flies. Its the flies that seem to drive some overs over the edge so to speak.
I have some horses that don't even seem to notice heat or flies, I have others that get in suCh a tizzy stomping rolling running they work themselves into a lather (even w sheets masks n sprays) so imo it would be cruel to let them deal w it. So these are the ones that are brought in away from the heat and flies early to enjoy some repreive from the elements.
Also the type of heat plays a huge roll. Yes there is a difference between dry heat and humid heat. We get VERY humid. We can have a mean temp of 90 but w the humidity it can feel like over 100...the air is so thick you can't breathe. The horses get soaked just standing. I'll take dry heat over humid weather any dAy lol
Also would like to add that flies and bugs tend to be worse in the shade hence why mosT horses or animals will stand /lay in the sun opposed to the shade :)
So to the OP. I say if your horse looks distressed, then maybe a chat to the BO is in order, but if the horse seems to be coping fine w the elements, then yes I'm sure she will be fine. Have to use your judgement based on what you see, not what I do or your neighbor down the rd does :)
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