Thanks for the information. I managed to get ahold of the farrier later yesterday, and she's comming out this morning to take a look. She said that she's been seeing a lot of this due to the constant changes in weather lately. He had another crack taken out a few weeks ago in the front on one of his front feet. He is on a 5 week trim schedule, but we've bumped him up to every four weeks for a few months when we noticed the first crack, just to be on the safe side.
He is barefoot, and this weekend was the first time I took him out of a gravel road(he's usually in the sand area) so I think that may have something to do with it. I'm going to talk to the farrier about measuring him for boots as we'll be going out of the trails this year. I got a picture last night, but didn't have a chance to upload it. I'll do that tonight and let you know what the farrier said. She didn't seem too worried, said its most likely just a surface crack and not into the inner wall, but I worry about my boy. He's never gotten cracks before this.
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