Who is Katie?
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Katie is a young tomboyish girl who works as a pet groomer and doctor at the local pet parlor. As said in "Pups Save a Train", she has a grandmother, but whether she is paternal (on her father's side of the family) or maternal (on her mother's side) is never said. She is great friends with Ryder and the pups, along with the children of Adventure Bay. She seems to be a big sister figure to Alex.
Katie cares about animals and makes sure they are healthy, well-bathed, and happy. Katie is kind, loving and caring. She is good with younger children, as shown in her interactions with Alex. She is friendly and patient to just about everyone. She can get annoyed by Rocky being stubborn about baths, though. She loves Cali with all her heart. She considers Cali a comfort animal, as shown in "Pups Save Luke Stars", when she kept Cali by her side to soothe her stage fright.
Katie has pale skin with blue eyes and long blonde hair with a red hairband with two pink hearts (depending on the lighting, the red and pink colors of her headband may appear switched). She wears a pink striped shirt, blue short pants, and purple shoes.
Here is a gallery of Katie's types of clothing throughout the series.