I think this may be more of a literary question than a horse one...
I believe it refers to "flogging a dead horse" which it a way of saying you are trying to get get results when the issue has been resolved or dropped.
It's a useless action. (A dead horse won't pull your wagon no matter how much you beat him.)
"When the horse is dead, get off" means you should not waste time on things that are not worth it. If the horse is dead, you can't ride it any more.
It means that you should stop talking about the subject because it's useless and already been talked about enough. (A dead horse won't do anything for you, no matter how many times you beat it.)
The actual quote is "stop beating a dead horse" stop wasteing time on a pointless activity.
- My efforts are futile - Pissing in the wind (Australian slang) etc. bark at the moon catch at shadows bite a file beat the air in vain plough the air etc.
The Horse Is Dead was created in 1996.
No good with a dead horse.
Although the situation may seem futile, the grass still serves as a source of nourishment for other animals and insects in the ecosystem. It also helps to prevent soil erosion and maintains the ecological balance of the environment, even if the horse is no longer able to benefit from it.
Usually "flogging a dead horse" imagine you are beating the horse trying to get it to move even though it is dead. It means that you are trying to do something that cannot be done.
Dead Horse - song - was created in 1991.
Dead lame means the horse basically can't move. It can also mean 'three legged lame' where three of the horses legs are lame.
a dead horse