Today when I showed up at the barn to feed Starship I got a serious scare, one of his front legs is swollen from below the knee all the way down.
I rode him in the arena yesterday and even when cooling down he seemed fine, he walked just as fast and even as he normally does.
We applied DMSO, gave him bute and wrapped him up for the night (he puts weight on his leg so I didn't think it was necessary to get the vet out on Friday evening).
Tomorrow his previous owner (race horse trainer) will come by to have a look at his leg, he has experience with strained and bowed tendons (please don't let it be that) and should he deem it necessary the vet will be called. We're still hoping for a spider or snake bite or anything besides the tendons.
Before tonight I had never heard of DMSO, is it the best "quick fix" or am I better off buying something else tomorrow? I'll be putting together a decent vet-kit to be better prepared in the future and will check out that particular post too, but I want to do right by Starship and get what will help best.