Acquisition by leading the animal only works in the city, if his deal was "Normal Riding": Bava Metzia 9a-b
Acquisition by riding an animal only works in a field, if his deal was acquisition by "Normal Riding": Bava Metzia 9a-b
The "Normal Way" listed Above is determined by the way practiced by Jews: Bava Metzia 9a
In Finding an Object
Whether leading constitutes Acquisition: Bava Metzia 8b-9b
Where one claimant is riding and one is leading: Bava Metzia 2a
Where one pulls and the other leads: Bava Metzia 8b-9a
Where both are leading a donkey: Bava Metzia 8b-9a
Where both are leading a camel: Bava Metzia 8b-9a
Whether riding constitutes Acquisition: Bava Metzia 8a-9a
Where both claimants are riding the animal: Bava Metzia 2a, 8a [2x], 8b
Where one is riding and one is leading: Bava Metzia 2a
Where one is riding and one is holding the reins: Bava Metzia 9a