One day, a dog was crossing a bridge, carrying a bone in its mouth.
Looking down, he saw his own image reflected in the water. Thinking he saw another dog, he immediately coveted its bone and started barking. But as soon as he opened his mouth, his own bone fell into the water and was lost forever.
The brief story of the dog and the bone talks about ambition and the consequences of always wanting more. The dog could have been satisfied with the bone he had, but as he saw the image reflected in the water, he wanted to have a second bone as well.
By not valuing what he had and risking his safe bone to get another, the dog ended up without one and without another.
The lesson we can learn from the dog in the story is that a bird in the hand is worth two in the bush.