Ancient lore says that the water buffalo was the first to introduce the "give me a treat" pity look! :)
Based on this guy's expression, I think it might be true. :)
The Water Buffalo is a large ungulate (hooved animal) and a member of the bovine subfamily. There are two general types of water buffalo. The Swamp (Bubalus carabanesis)which are found from the Philippines to as far west as India, and River (Bubalus bubalis), which are found farther west from India to Egypt and Europe.
The water buffalo has been associated with man from the earliest prehistoric times. Although the water buffalo was originally an Asian animal, it arrived early (about 600 A.D.) in the Near East and North Africa. It was introduced to Europe by crusaders returning in the Middle Ages.