Willie calls him Rufio after the Lost Boys in Peter Pan because the former is a "lost dog."
Rufio is a feisty Scottish Terrier. He is very active and full of energy. At first, he growls when he was about to be put on a leash, but soon he gets used to it.
- Dog Days (first appearance)
Rufio is a grey Scottish Terrier. He looks somewhat like Jock from Lady and the Tramp and McGregor from Nine Dog Christmas.