Once, a dog went out in search of a master. He wanted the strongest being on the earth to be his master. While searching, he met a fierce wolf. The dog thought him to be strong and accepted him as his master. But when the wolf saw a bear, he got scared and ran away. So, the dog made the bear his master. Both the bear and the dog went along. Soon, the bear heard the roar of a lion. He told the dog to save his life, else the lion would kill them. The dog realised that the bear was not the strongest being after all. He decided to accept the lion as his master. The dog and the lion lived together happily for many years. But one day, the lion saw a man. He got scared and ran away. This was when the dog realised that humans are the strongest on the earth. From then onwards, dogs started serving men.