'Bulldog bat' definitions:

Definition of 'Bulldog bat'

From: GCIDE

Bulldog \Bull"dog`\, a. Characteristic of, or like, a bulldog; stubborn; as, bulldog courage; bulldog tenacity. [1913 Webster]
Bulldog bat (Zo'94l.), a bat of the genus Nyctinomus; -- so called from the shape of its face. [1913 Webster]