The ladies who were with her at the birth found, where they thought to find a child, the most grotesque and ill-favored beast, as you have already heart, and they experienced such great fear that they all died except her and one other lady. The beast ran away, so that there was no one in the palace or the castle who could bring it back, and and it ran uttering the greatest barking in the world.

The Post Vulgate Quest for the Holy Grail