The Bat-Cow is a member of the Tiny Titans' Pet Club, and the Just Us Cows. It is an ordinary cow that stole a spare cowl from the Bat Cave.
A cow appeared in the pages of Batman Incorporated. Tainted by Leviathan, Bat-Cow was saved from slaughter by Damian Wayne.
Bat-Cow was initially created by Art Baltazar and Franco for Tiny Titans, then revamped by Grant Morrison and Chris Burnham. Bat-Cow's first in-continuity appearance is in Batman Incorporated Vol 2 #1, which was released in July, 2012.
Powers and Abilities
Bat-Cow has no powers or abilities, it is a normal cow with the exception being its meat is contaminated with a mind-control drug of some sort, so that when the people of Gotham or whoever eats the meat will be susceptible.