The Donkey and the Dog

There was once a washer man who had a donkey and a dog. One night when the whole world was sleeping, a thief broke into the house, the washer man was fast asleep too but the donkey and the dog were awake.
The dog decided not to bark since the master did not take good care of him and wanted to teach him a lesson.The donkey got worried and said to the dog that if he doesn't bark, the donkey will have to do something himself.
The dog did not change his mind and the donkey started braying loudly.Hearing the donkey bray, the thief ran away, the master woke up and started beating the donkey for braying in the middle of the night for no reason.

Moral of the story “One must not engage in duties other than his own”