In the pilot episode "Flippin' Fido", the character of the brown dog is named "Fido" hence the title. In the Season 2 episode, "Head Banger Buddy", the name "Fido" is given to a yellow-skinned dog of a different species, due to the name "Fido" being in that dog character's pet bowl. The same dog that debuted in this episode re-appears in the Season 4 episode "Disc Temper" where he volunteers as a guard dog, but renamed to "Mugger".