Until you trim and shoe a horse yourself it's hard to understand how easy it is to make a horse a little sore. You don't know they will be sore sometimes until you put the foot down and lead them off. I have rasp a foot down too short and had it bleed a little, put the shoe on and had zero sensitivity. I've trimmed a horse to what I thought was the perfect lenght and there was no sign of sensitivity but when I put the foot down the horse walked like the pain was nearly unbearable.
Don't judge a farrier too harshly if it only happens rarely. She may have had a chip or other flaw that he was trying to get out and trimmed shorter than he otherwise would have.
I was thinking that 4 days was a little long for her to be sore from a short trim.
There's nothing like the Rockies in the springtime... Nothing like the freedom in the air... And there ain't nothing better than draggin calves to the fire and there's nothing like the smell of burning hair. -Brenn Hill