Lady and the Tramp
Lady and the Tramp was an animated 
Disney movie made in 1953. It was about a cocker spaniel named Lady who lives with a rich family and a great dane named The Tramp who lives on the streets. Once they meet each other they fall in love and share an adventure together.  This movie was so popular it spawned a spinoff comic titled 
Scamp which happens to the name of one of Lady and the Tramp's puppies. The movie even spawned a sequel in 2002 titled 
Lady and the Tramp 2: Scamp's Adventure.
Also See
List of fictional dogs