Thanks for all of your helpful replies.
eruss: My horses are gaited and to help them stay in gait, we use lighter weight shoes in back.
The farrier said that my older horse’s shoe was wider one one side of the frog that then other which was why the shoe was bigger on the inside. Except the shoes are bigger on both sides of both feet! With my younger horse, I was told that they wanted to get the foot to grow wider, to open up at the heels which was why they also used fewer nails at the heel. The extra shoe in the back and on the sides would provide more stability for the hoof.
The reason I was skeptical (and am embarrased to be so) is that the farrier’s son told me during the winter that sometimes they don’t have the right shoes on the truck and then “wing it” and that his dad was better at talking the ladies into accepting the shoes (giving them an excuse) than he was. I was in the barn the entire time the horses were being shod. If they were doing something different or there was something new that needed attention (widening the heels for example), it seems they would have told me as they have in the past.
But your posts reassure me. Like too-short haircuts, the hooves will grow. In the future, before the farriers leave and before I give them the check, I think I’ll ask, “Is there anything new or different or any issues that were addressed this time that we need to discuss?”