Every movement of the horse-each twitch of the skin, flare of the nostril, flicker of the eyelid, swish of the tail-is a gesture laden with meaning. For the most part, we miss, disregard, or misinterpret these signals, which inevitably lead to confusion on the horse's part and frustration on ours. But all this can change now: Horse Speak breaks down the subtle physical language of the horse into its most basic elements, providing visual markers we...