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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Rover's playmate 4 letters:

FIDO: Rover's playmate
SPOT: Rover's playmate
FIDO: Playmate for Rover, perhaps
REX: Rover's playmate
REX: Playmate of Fido and Rover