So I can for sure scratch bleeding off the list of possibilities, he runs on lasix and Kentucky red. Isn't getting washed out by the lasix either bc he did this before running on lasix.  He gets to the 2nd and 3rd days and literally stays the same speed or gets a tick slower than the first day. Hes young and consistently passed vet checks with different vets. Hes in great shape condition wise. Can I attribute this to soreness or just it is what it is? I've always had horses get like .3 tenths faster on the 2nd day.