Her appearance is unknown, since she was only mentioned.
Her personality is also unknown.
Her history is largely unknown, although Pedro said that she was one of the former girlfriends of Tramp.
- Rosita has one of the longest names in Disney history.
- She is one of two known Chihuahuas in the original movie.
- It is unknown what happened to her after dating Tramp, or even if she is still alive.
- She is one of only a few characters to only be mentioned.
- She is the first sister ever mentioned/seen in Lady and the Tramp.
- Ironically enough, she has a long name, similar to Tito in Oliver and Company, who is also a Chihuahua.