Dewlap
The loose fold of skin hanging under the throat and chest, very large in zebu cattle.
Also: sasna, neck fold
The dewlap is the flap of loose skin that hangs from the lower jaw down the throat to the brisket. Taurine cattle have a small one; in zebu breeds such as the Gir, Kankrej and Nelore it can be deep and pleated, reaching almost to the forelegs. Its size is often explained as extra skin surface that helps an animal lose heat in hot climates, an idea that is widely repeated though hard to measure. The Sanskrit grammarian Patanjali defined a cow by its dewlap, tail, hump, hooves and horns, and breed standards in India and Brazil still describe the dewlap's shape. In English the word is also used for the throat flap of lizards and some dogs.