Dr. Miller a lifelong horseman, a veterinarian has had a professional relationship with Western Horseman since 1949. He visited with Katie Frank on foal imprinting, starting colts and his love for mules.
Source: Western Horseman, September 2016, page 44. (no link available)
‘If you love your horse . . . don’t start them until they’re three. And don’t train them for (any) discipline until four,’ said Miller.