He carried the piece of cheese in his mouth and went on. While he was going beside a stream the dog saw his reflection in the stream's water.
Oh! There is another dog like me, he is also carrying a piece of cheese. I will have two pieces of cheese if I get that piece too.''
Thinking that he opened his mouth to catch the piece in the water, and as soon as the dog opened his mouth ,the piece of cheese that he held fell into the water.
Ah! Due to his greed and the urge to get another piece the dog lost his piece of cheese too.
As they say '' Much wants more loses all.''