A common name for a dog, especially used generically to refer to any family pet dog in a playful or old-fashioned way.
From Latin 'Fidelis' or 'Fidus,' meaning 'faithful' or 'loyal.' This name was chosen for dogs because it captured the essential dog trait of loyalty and faithfulness to their owners.
Parents named their dogs 'Fido' specifically because the Latin root 'fidelis' (faithful) was stamped right into the name—when you called your dog Fido, you were literally reminding it and everyone else of the one quality that made dogs different from every other animal humans owned.
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