Closing the barn door after the horse escapes.

So hungry I could eat a horse.

All lay loads on a willing horse!

Don’t look a gift horse in the mouth.

Don’t change horses in the middle of the stream.

You can lead a horse to water but you can’t make him drink.

If wishes were horses beggars would ride.

A fence lasts three years, a dog lasts three fences, a horse three dogs, and a man three horses.

Don’t put the cart before the horse.