Bessie

From Sam & Max Wiki

Bessie is a cow that appeared in Situation: Comedy. She is a star of the TV Show on WARP, Midtown Cowboys (along with Sam, Max & Mr Featherly). She must be disguised by Sam & Max as the point is to prevent Mr Featherly from catching a cow in their house.

Bessie doesn't seem to be much smarter nor different than any other cow, but that didn't stop her from getting a guest appearance at Myra Stump's show. Sam sees her as a big rival. Also, she is the one who ended Myra's reign of evil by electrifying her.

She later appears in Night of the Raving Dead, where she, Sam, Featherly & Max are shooting another episode.