Bava Kamma 118: Count Your Sheep!
4 mishnayot: Paying back an original owner should not take place in a deserted area. And: does one have to pay when one can claim ignorance of a need to pay back (certainty vs. unsure bring relevant). And: Stealing a lamb from a flock and returning it before anything happens to it - what happens if the owners knew? What happens if they didn't know? Rav, Shmuel, R. Yochanan, and R. Hisda has answers. And: The assumption that a wife isn't lying to her husband when selling animals in the marketplace - but let the buyer beware!