The other day my I was grooming my horse and then he randomly started tossing his head around. He would fling it around some then stop, then he'd start up again. Then yesterday he did it a little while I was riding. Also while I was riding he would swish his tail or kick out a little when he started cantering. I was at a show so I don't know if it was because he was nervous about being there (because he always gets super nervous at shows) or something else. Anyone have any ideas?