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A lazy horse will do nothing except stand still - except on Sundays, when she sits down.
She won't 'giddy up' for the farmer, nor 'trot off' for his wife, nor play cowboys for their son, nor jump for their daughter.
There are no incentives that will work. Not carrots, oats, apples; not even a sugar lump! So she gets sold to a tinker, and then to the circus - and then to a butcher. And then the dozy dobbin demonstrates that, though lazy, she isn't stupid: she runs like the wind!