Human's tend to say …
you smell like a horse. Go figure!
Neigh-sayers, hold your horses!
Don't beat a dead horse, or you may wind up with a Charlie Horse.
Don't look that gift horse in the mouth, he just may be a horse of a different color.
You might be in a one horse town, but putting that cart before the horse can get you into trouble.
People in this town may tell you it came straight from the horse's mouth, and point their hooves
So, you better just get off your high horse, and quit horsing around,
or you may be put out to pasture.