There was an onager who watched a tame donkey walking along the road, weighed down by a heavy load, while the whip-wielding donkey-driver walked beside him.
"How happy I am to live wild and free!" thought the wild donkey. "I do what I please, and I go where I want."
Meanwhile, a lion crept up quietly. Fearing the donkey-driver, he avoided the tame donkey and instead attacked the unprotected onager, who did not stand a chance against the lion's sharp teeth and claws.
"How happy I am not to be food for a lion!" the tame donkey thought to himself.
Inspired by: Mille Fabulae et Una, a collection of Latin fables that I've edited, free to read online. I am not translating the Latin here; instead, I am just telling a 100-word version of the fable.
Notes: This is fable 148 in the book, which is Perry 411. For more about onagers, see this story: The Wild Donkey's Good Luck.