La Fontaine's fables told such a story.
After a war that had lasted a thousand years, the Wolf Kingdom and the Sheep Kingdom finally made peace. It was clearly a win-win situation: the wolves had eaten many lost lambs, while the shepherds had made quite a few garments from wolf pelts.
Whether the sheep grazed or the wolves hunted for meat, neither side had ever been free. Even eating was always fraught with fear.
Now they exchanged hostages: the Wolf Kingdom handed over wolf cubs, while the Sheep Kingdom handed over sheepdogs. Representatives from both sides mediated the matter, and the exchange ceremony proceeded as usual. But after some time, the cubs grew into adult wolves. Taking advantage of the shepherd's absence from the fold, they bit half the fattest lambs to death, then carried them into the woods. They had long secretly conspired with their accomplices. The sheepdogs, trusting the wolves' assurances in the Wolf Kingdom, rested without worry, only to lose their lives in their sleep.
There was another story. A wolf had starved until it was skin and bones when it encountered a large dog. The dog had accidentally lost his way. He was handsome, strong, fat, and had gleaming fur. The wolf dearly wanted to attack this stray dog, wishing he could tear him to pieces. But a fight was unavoidable, and the sheepdog was so much larger that he would certainly resist with all his strength. Lord Wolf had no choice but to step forward and flatter him humbly, saying that the dog's prosperous appearance filled him with envy.
The sheepdog was pleased to hear this. "Honored sir, becoming as strong as I am depends entirely on your own wishes. Leave the woods, and you will be entirely different. How miserable your kin are in