Once a dog was feeling hungry. Then he found a Chapati. He wanted to eat chapatti with full enjoymnet. So he took the chapatti in his mouth and went towards river. There was a small bridge over the river. When the dog was crossing the river, he saw his shadow in the water. He understood that there is another dog and wanted to snatch his chapatti.
To snatch the chapatti he started barking and jumped into the river. When he opened his mouth the chapatti fell into the water and the greedy dog remained hungry.
So it is said we should not be greedy.