Outdoor Animal - Many individuals prefer a guide animal that does not have to live in the house when off duty.
so the horse could have (a) friend(s) outside.
Many horse do like to have a clear and usefull function and according to horse logic, this would certainly count as usefull, where as doing competation and walking with your body in a certain frame is probably not...
I have no realy opinion about this just thinking out loud here. Certainly not all horses would be suitable for this, the same with dogs, humans... Giving care like this, is a gift, is it not?
About the dog... we had got Mike for Gina thinking she would love a dog compagnion, but she hasn't been as happy since he has passed away (yes she greeved, but after half a year, she is much more content then when he still was with her).
She gets to see dogs of course and plays with dogs that come to visit.
It's like a human living alone with dogs and meets humans outside the house