Sweetie is considered to be a West Highland White Terrier.
She is the second animal (seventh if one counts the Kitten Catastrophe Crew as separate antagonists) to be an antagonist in the series, the first being the Kitten Catastrophe Crew, and the first example of a pup antagonist.
She is the third female pup overall.
Her originally planned voice actress, Brianna Daguanno, is also the voice of Luna Girl on Disney Junior's PJ Masks. However, she was replaced with Anya Cooke before the episode was released.