It's the Cocker Spaniel.
Here's why:
* Lady and the Tramp: The iconic Lady is a Cocker Spaniel.
* 101 Dalmatians: Cruella de Vil's desire for dalmatian puppies makes this breed very prominent, but there are also Cocker Spaniels in the film (like the one who helps the puppies escape).
* The Fox and the Hound: The young hound, Tod, is a Cocker Spaniel.
* Other Appearances: You'll see Cocker Spaniels in many other Disney films, including "The Aristocats," "The Rescuers Down Under," and more.
While Dalmatians might be the most instantly recognizable thanks to "101 Dalmatians," the Cocker Spaniel truly has a long and illustrious history within Disney animation.