Acquisition by the Passing of the Object from One to Another
Mechanics and Conditions
Takes Effect when the purchaser has a grasp on a section of 3 squared finger-breadths: Bava Metzia 7a
How it is done for an animal: Kiddushin 22b
Whether passing a single leash, connected to many animals, acquires all of the animals: Kiddushin 27b
For Which Entities this Works
For a large animal: Kiddushin 22b, 25b; Bava Kama 11b