What made the dog, the horse and the ox very angry?

All the three animals, the dog, the horse and the ox were angry because they had been asked to do extra work while the camel did absolutely no work.

The dog was assigned the task of fetching and carrying the things. The duty assigned to the ox was to carry the yoke on his neck and plough the field.

The Djinn that the horse was complaining against the camel because he was the in charge of all deserts and knew about everything happening in relation to his deserts.

The camel's looking at his own reflection in the pool shows that he was vain of his gain looks, especially his back. He was looking into water to admire himself.

The camel lived in the middle of the desert because he did not want to work. In ate sticks, thorns, and pickles, and when anybody spoke to it, it said 'Humph!' and nothing more.