She's a feisty white Pomeranian and the pet of Stanislav.
Snowball is an extremely fluffy white dog, to the point where she looks like a snowball with a face. Her legs are very small compared to the rest of her body, and she also has beige eyes and usually has an angry expression.
She speaks with a Slavic accent. In the short "Disco Pups", she used the world nie that in Polish and Slovakian language means no. That could mean that she is from Poland or Slovakia.
A running gag is that her owner Stanislav pulls her back on a leash while she is speaking.
Her appearance (being so fluffy that she looks like a snowball) is likely the reason why she is named Snowball.
Along with Hansel and Godfrey, she is the one that did the most World Wide Woof calls in the series and the female that did the most calls as well.