'Callen "Callie" Harper is a rider at Canterwoood she is a dressage star and has Sasha's BFF since day one. her horse is a black Morab gelding called Black Jack, or Jack as she calls him. She tries out for the YENT with Sasha, Heather and Jasmine but doesn't make it. Later on the series though, she makes it when she tries out for the second time along with Julia and Alison. She and Sasha get into a big fight in Little White Lies, but they make up in Unfriendly Competition. She has a relationship with Jacob, but they break up in Home Sweet Drama. Callie is a great, kindhearted rider. She loves horses!