From Diablo Wiki

<item type="single">The Clipper</item>

An unique dagger dropped by an rare Zombie Dog named Nine Toads. Double Reference to Boarderlands and the first boss Nine Toes, dropping an edged pistol called The Clipper with the exact same item description.

http://borderlands.wikia.com/wiki/The_Clipper

http://borderlands.wikia.com/wiki/Nine_Toes