Stella is an energetic basset hound who's first seen at the beginning of the film, given to Charlotte as a puppy from her father, Eli "Big Daddy" La Bouff. She's later seen at the La Bouff masquerade ball in a Roman Centurian-esque costume, begging for one of Tiana's benighs, to which Tiana replies "Okay, but just one". When Tiana accidentally knocked into the table and ruines her outfit, Stella's later seen eating the rest of the benighs that remain on the ground. Then after Tiana had turned into a frog, Eli "Big Daddy" La Bouff called for Stella to get the two frogs, which had resulted into chase though the masquerade ball and across a dining table, leading to a huge net. Right when Tiana and Naveen got tangled up in the balloons, Stella says, "Tiana?" Tiana is surprised and shocked to hear the dog actually talk. She is not seen again.
Stella is probably named after the character Stella from A Streetcar Named Desire.