First time I hear a cat being called Butler! Cute! xD
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Thanks!
The game is based on Facebook groups "This Cat is Butler" and its variants. In those groups, all black (or other) cats are called Butler.
The meme has a story. Once, a cat owner posted her cat's (Penelopecat) photo on Facebook. Then someone on her friend list stole the photo and claimed the cat was her cat, Butler. This event became the source of a meme, where everyone claimed Penelopecat was their cat or their black cat was called Butler.