In early versions of the script, Tramp was called Homer and although he was first conceived as Lady's suitor, competing with an early incantation of Boris for her affections, he ended up as her ex-dog pound mate in the final 1943 storyboard pitch. A few years after that version was scrapped, Walt read a story called "Happy Dan the Cynical Dog" in Cosmopolatin Magazine and decided that such a character as him was just was was needed to enhance the film. Although Walt wanted his new character to be called Tramp, the animators feared that audiences would take offense in such a name, due to the word's sexual connotations ("the lady is a tramp".) So, they first called him Rags, then Bozo, before Walt insisted that Tramp would be fine.
Tramp is a medium sized, scruffy looking dog. He is mostly dark gray with lighter gray muzzle and stomach. After he is taken in by Jim Dear and Darling, he wears a red collar with a diamond shaped license.
In the first film, Tramp is a very laid-back character and he's more like a kid. He prefers to live in the family and home. It's implied that he's flirtatious, given his history of having had a multitude of girlfriends. He's known for his street smarts, able to both avoid dog catchers and deal with junkyard dogs. He dreams to live in a family and home that he won't get captured by dogcatchers. In the sequel, after he and Lady have married and now have a litter of puppies, Tramp's grown accustomed to being a house pet, but still retains his street smarts. He is also portrayed as being a loving yet firm father to his son, Scamp, and his three daughters, Annette, Collette and Danielle.