I had to switch from a trimmer to a farrier as there was a good possibility one needed shoes. The horses are relaxed with the new guy. The trimmer was good to them, patient, etc but they seemed to pick up on his energy. Perhaps he felt under pressure, work pressures at the day job, something. The farrier said he was told a horse can sense your heart beat ten feet away and when he was fretting about something not one horse was cooperative.