Premise: Fido Dido is a cartoon character created by Joanna Ferrone and Sue Rose. Rose first developed the character in 1985, on a napkin in a restaurant. They later stenciled Fido on T-shirts with the credo: "Fido is for Fido, Fido is against no one". These T-shirts became very popular in New York.
Hypothesis: Fido Dido was inspired by a television cartoon character.