The Mask

A strange mask wearing women comes to the farmhouse and says dogs are evil. With that, she hits Courage. Muriel thinks they are just playing and invites her to tea. While there, she says that long ago her best friend Bunny fell for a horrible dog. After trying to convince her to leave, the dog threatend her and she had to leave. After that, she rerapedly hurts Courage. At dinner, she says that she wears her mask to hide from reality. Muriel says she has to face reality, but she reveals that Muriel has been sneaking food and Eustace can't fix every thing like he says he can. This causes a fight between Eustace and Muriel. Courage spys on the woman that night and sees her play with a toy mouse. She takes off her mask to reavel she's a cat. Convinced she's a wanted crimnal, Courage locks the doors to the bedroom and attic doors, steals the mouse, and drives off to go to the police.
He stops at a diner where the rat reconizes the cat's mouse and says her names Kitty. He says Bunn

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S04E14 - Squatting Tiger, Hidden Dog