I had vet Susan McCartney check him out for me later in the morning to see what she might be able to find. He did have some sensitivity with hoof testers to his left front frog. Not sure how that bothers him enough overnight, with boots on in perfect sandy footing, to get that kind of reaction. We were all a bit baffled. For now I have a couple of theories:
- I had his boot on too tight. I don't normally use athletic tape unless at an actual endurance ride. I find I don't need it for regular training, but appreciate the tighter fit and security provided with three wraps of tape around the hoof. It also helps to keep sand and other small debris out of the boot. On that particular foot only, when I put the boot on the tape rucked up from around the bottom of the hoof wall, and kind of was bunched around the top of the Easyboot Glove. It tooks a screwdriver to pry the boot off. Perhaps this pressure overnight was too much and caused the soreness.
- He got cramped and chilled standing in the wind, rain, and snow overnight. I did my best to park so he was on the lee side of the trailer, but it was still quite windy (gusts to 50 mph) on Friday evening and poured rain off and on until around 3 am, when the temps dropped and it switched to snow and froze everything that was wet. I forgot my good insulated winter blanket at home, so had Diego in a polar fleece cooler with a waterproof sheet over that. While he was totally dry and felt warm to the touch, perhaps he got chilled and cramped.
- He stood in one place too long due to the weather (seeking shelter) and was stiff/cramped. Again, same circumstances as above. I actually considered putting him IN the trailer Friday evening as I climbed into bed, but I cannot shut the rear door of my trailer with the divider open (design flaw) and I didn't want him standing in such a small area overnight. Perhaps he ended up doing just that anyways.