People are hard to be around, they can be slow, messy, smelly, noisy, irritating and dim witted. But we still choose to be around them. Horses are the same, they can give each other all sorts of grief, but they still get very upset when you seperate them. When I work with horses I try to keep my work consistent with the pressures they would get from other horses out in the paddock, if you exceed that you start doing damage to your relationship with your horse.