Word Play; Horse Play

Perhaps it was coincidence, perhaps the crisp and clean Mongolian air getting to me after seeing so many cities, but I started to notice that there are a horse load of "horse" related idioms. Here is a list that Ethan and I thought of during our trek through the Gobi Desert and Hangai Mountains (but I didn't beat a horse to death in trying to make it all inclusive):

1. Don't look a gift horse in the mouth
2. Horse around; Horse play
3. Eat a horse (we actually did eat some horse and camel meat along the way)
4. On a high horse
5. Putting the cart before the horse
6. You can lead a horse to water but you can't make it drink
7. Beat a horse to death
8. From the horse's mouth
9. Hold your horses
10. Dark horse

There are definitely more, so feel free to comment and add.