Please stay away from script style fonts, purple or light blues.
Color scheme is black/white/grey with small amount red for contrast. Navy with red would be acceptable. Barn colors are Navy/khaki/ with red highlights.
The horse graphics or illustrations need to be hi quality. If you are not comfortable selecting or illustrating horses, logos without horses are acceptable. Bits, saddles, boots, spurs, crops, helmets, fields, pastures, barns, fence lines, and jumps are other ideas.