DC Database
The subject of this article has been mentioned only and never actually shown in a comic book or on-screen. Despite their lack of physical appearances, information about them might still be relevant or interesting or at least worthy of documentation. Anything known about them is to be considered second-hand information.

Ace is Bruce Wayne's pet dog.

During Scarecrow and the Arkham Knight's coordinated attack on Gotham, Ace's dog bowl could be found in Bruce Wayne's office in Wayne Enterprises.