Originally Posted by Running Whisper
The horse will survive, if he gets to cold he'll just challenge the older guy.
Don't count on that. My horse that is 4th in the herd order was also last in the order at the Seller's.
They had beatch of a mare that would NEVER let Joker have shelter in the barn. There was more than ample room for four horses but she would guard that door so Joker would be outside in the pouring cold rain until he started shivering.
To make matters worse, this horse's winter coat is slicker than some horses summer coats, so it didn't take much for him to get cold. The lady would have to get the B-horse out of the doorway, bring Joker in and lock him in a stall until he warmed up.
It's your judgement call by all means. My point is to never assume a horse lower in the herd order will find to get in the barn if it's cold. To the contrary, it will stand outside and shiver itself to death because that is how "Survival of the Fittest" works