* Lady: A Cocker Spaniel. This is the most commonly accepted breed, based on her appearance, floppy ears, and gentle temperament.
* Tramp: A American Pit Bull Terrier. While his appearance is more mixed, he shares many characteristics of a Pit Bull: a muscular build, short coat, and a strong jaw.
However, it's important to note that the movie's creators likely drew inspiration from various breeds, and the characters are ultimately fictional.