Dedication by Keith Feldman. With what may an animal go out on Shabbos? Proper restraint vs. insufficient restraint vs. excessive restraint. The latter two create a prohibited burden for the animal. Incident of Levi ben Rav Huna bar Hiyya and Rabba bar Rav Huna, who were riding together on their donkeys. Excessive restraint is not a burden in the case of the treasured Red Heifer. Relationship of intent to Tumah, ritual impurity, in fabricating a ring.