The Bodhisatta was once a rich merchant and had a herdsman to guard his cows in a forest paddock. They gave little milk through fear of a lion living in the forest. The merchant, knowing that the lion loved a doe, had her caught and her body rubbed with poison. When she returned to the forest, the lion licked her body and died.
The Buddha related this story to the monks to show them the necessity for circumspection in accepting gifts. J.i.387 f.