When a horse has Shivers, the hind quarter muscles will actually “Shiver” or tremble slightly when backing the horse up. Some horses do better with a higher protein diet as well as not having the starches. This horse will have less control of the hind leg when picking it up for a hoof clean out or for a farrier. They often bring it to the side and tremble slightly. They often become reluctant to pick up the hind hoof. This can be avoided by quickly drawing the hoof that is raised out behind the horse and use a lot of patience.
"No hour is wasted that is spent in the saddle." -Winston Churchill