1) Headshake 2) Horse disease 3) Motility 4) Motion 5) Move 6) Movement 1) Headshake 
Headshaking is a condition where the horse or pony shakes its head continuously, often while being ridden. Originally considered a bad habit, it is now thought that some horses are allergic to certain pollens, which causes them to headshake. However horses also normally react to flies, and headshaking may be a fly defence overreaction even if flie...