Two fillies, both about to turn 4, are beginning dressage training. One came from the track, the other from the breeder’s field. Each horse requires a slightly different approach, and each one offers a few advantages over the other, as well as a few drawbacks. Here’s a side-by-side comparison. Filly #1: Boogie Rose, 15.2 hand bay OTTB This pretty girl is dainty and elegant. Light on her feet, with athleticism to spare. She’s a worker-bee and thrives on exercise and discipline. She likes routine, attention, and is at her best when her energy is channeled into work. She also has a tendency to channel that energy is less-favorable ways when…