[Verginius Rufus]

Did a Google search--Spot is described as an English springer spaniel, and Millie as a springer spaniel. I assume she was an English springer spaniel, since her book was in English.

[Wolfstar]

Just a note of clarification, in case you're interested: The American Kennel Club lists the breed as English springer spaniel. Many people refer to it just as springer or springer spaniel for short.