What Æsop teachs us about treachery

A Wolf had been feasting too greedily, and a bone had stuck crosswise in his throat. He could get it neither up nor down, and of course he could not eat a thing. Naturally that was an awful state of affairs for a greedy Wolf. So away he hurried to the Crane. He was sure that she, with her long neck and bill, would easily be able to reach the bone and pull it out.
"I will reward you very handsomely," said the Wolf, "if you pull that bone out for me." The Crane, as you can imagine, was very uneasy about putting her head in a Wolf's throat. But she was grasping in nature, so she did what the Wolf asked her to do. When the Wolf felt that the bone was gone, he started to walk away.
"But what about my reward!" called the Crane anxiously.
"What!" snarled the Wolf, whirling around. "Haven't you got it? Isn't it enough that I let you take your head out of my mouth without snapping it off?"

An Ass and a Fox had become close comrades, and were constantly in each other's company. While the Ass cropped a fresh bit of greens, the Fox would devour a chicken from the neighboring farmyard or a bit of cheese filched from the dairy. One day the pair unexpectedly met a Lion. The Ass was very much frightened, but the Fox calmed his fears.
"I will talk to him," he said. So the Fox walked boldly up to the Lion. "Your highness," he said in an undertone, so the Ass could not hear him, "I've got a fine scheme in my head. If you promise not to hurt me, I will lead that foolish creature yonder into a pit where he can't get out, and you can feast at your pleasure." The Lion agreed and the Fox returned to the Ass. "I made him promise not to hurt us," said the Fox. "But come, I know a good place to hide till he is gone."
So the Fox led the Ass into a deep pit. But when the Lion saw that the Ass was his for the taking, he first of all struck down the traitor Fox.

A Wolf prowling near a village one evening met a Dog. It happened to be a very lean and bony Dog, and Master Wolf would have turned up his nose at such meager fare had he not been more hungry than usual. So he began to edge toward the Dog, while the Dog backed away.
"Let me remind your lordship," said the Dog, his words interrupted now and then as he dodged a snap of the Wolf's teeth, "how unpleasant it would be to eat me now. Look at my ribs. I am nothing but skin and bone. But let me tell you something in private. In a few days my master will give a wedding feast for his only daughter. You can guess how fine and fat I will grow on the scraps from the table. Then is the time to eat me."
The Wolf could not help thinking how nice it would be to have a fine fat Dog to eat instead of the scrawny object before him. So he went away pulling in his belt and promising to return. Some days later the Wolf came back for the promised feast. He found the Dog in his master's yard, and asked him to come out and be eaten.
"Sir," said the Dog, with a grin, "I shall be delighted to have you eat me. I'll be out as soon as the porter opens the door." But the "porter" was a huge Dog whom the Wolf knew by painful experience to be very unkind toward wolves. So he decided not to wait and made off as fast as his legs could carry him.