put the saddle on the right horse

beat a dead horse

To persist or continue far beyond any purpose, interest or reason.

burr in one's saddle

Synonym of bee in one's bonnet.

charley horse

A muscle cramp, usually a strong one, in the thigh, leg, arm, or core.

close the stable door after the horse has bolted

To attempt to prevent a problem that has already occurred; to design and implement a preventive mechanism that is too late (after the first failure instead of before).

come right

to have a successful or satisfying conclusion; to end well

coming right up

Used by the speaker to indicate readiness to provide something ordered or requested.

damn right

Expresses enthusiastic support or opposition, agreement or disagreement, certainty or emphasis.

dark horse

Someone who possesses talents or favorable characteristics that are not known or expected by others.