The Greedy Dog
One day, a dog stole a big piece of meat and he was very proud of it. Then, he ran off until he reached the bank of river. He looked down into the river water. He saw another dog with a piece of meat in its mouth.
Funnily enough, the dog didn't realize that it was his own reflection in the water. When he was full, he threw himself on the other dog to steal his meat as well. Unfortunately, when he was in the water, he had to let go the remains of the meat to avoid drowing, and so was left with nothing.