Here are some olde horse proverbs for your consideration:
1. It is a good horse that never stumbles.
2. Mettle is dangerous in a blind horse.
3. A horse is neither better nor worse for his trappings.
4. One may take a horse to the water but you can't make him drink.
5. Get upon a high horse.
6. Putting money on the wrong horse.
7. Flogging a dead horse.
8. One must not look a gift horse in the mouth.
9. Putting the cart before the horse.
10. While the grass is growing the steed is starving.
11. A horse, a horse, my kingdom for a horse.
12. An two men ride on a horse, one must ride behind.