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

Crossword clues for Fido's greeting:

ARFS: Fido's greetings
ARFS: Greetings from Fido
WELCOMEWAG: Fido's greeting?
ARF: Greeting from Fido
WOOFS: Greetings from Fido
ARF: Fido's greeting
GRR: Fido's angry greeting