We call our horses up by name, and we use the word "hep". I have trained my Thoroughbred to come to me with a "hi-lo" whistle that I have used for a long long time. It's always been one of my trademark kinda things. My kids, wife, and all our animals know when they hear it, it's me. Sonny, my Thoroughbred, knows that when he hears it, I'm waiting for him to come! No matter what he's doing, it's heads up, he looks for me, and comes right to me. I remember when we watched "War Horse" and he called his horse at the end of the movie, it made me smile, and gave me a big lump in my throat. I immediately thought of my Sonny Boy.
Ill be talking to my dogs and they will be at the gate by the time I reach them. In the pasture I can go "come here boy/Flash" point to him and pat my thigh and he will come over most of the time... its like I have a VERY big dog considering he's the biggest horse... I can say Harleys name and he will come... most of the time. Ill say all their names "harley, Flash, Cody' adn they will come over also if they are in the big pasture.