I had my farrier out today to trim Playboy's hooves,long story short he refused to pick up his right hind leg. After about five minutes of gentle coaxing he snatched it up quite high and his leg tremored/shook quite badly for a while and then it stopped. My farrier suspects shivers and is quite sure that is it. So I looked it up, sounds like it, but then somehow got sent to a site about stringhalt and all of the sudden things started making sense! I occasionally see PB when standing lift his hind leg up (R) rapidly flex it then kick down violently. I'm am trying to get the vet out next week (about to call) but wanted to see what you think, as I am very unfamiliar with either of these diseases. Whatever it is does not affect his way of going, he is not lame, w/t/c/jumps fine. Anything you can tell me about either of these would be great!Thanks in advance!