Some horse carers have an incredibly close connection to their horses that it seems almost telepathic. Their horses are able to respond so well to their cues that it seems like the horses are reading their minds. This phenomenon is actually common among horses themselves. They have no voice to communicate with each other, but can communicate effectively anyway. Using animal communication is using telepathy to communicate with the horse.
For instance, fear is something that spreads very easily in a group of horses. This characteristic evolved for the sole purpose of improving their survival in the wild where raising an alarm on a threat is crucial to the safety of the herd. This characteristic is something that natural horsemanship practitioners have learned to make use of in horse training.