Nicki (american girl: girl of the year 2007, book 1)

Nicki Fleming is a 10-year-old girl who is a natural with animals. She lives on a working Colorado ranch with her parents and younger brother. She is optimistic, generous, and compassionate, and she loves skiing almost as much as she loves animals. Nicki has a hard time saying "no" to people. Whenever anyone asks for her help, she's ready to lend a hand. When Nicki says "yes" to becoming the main trainer of a service dog that she and her mother had planned to train together, Nicki ends up in over her head, and struggles to juggle multiple responsibilities: to her parents, her best friend, her teacher--and to the dog.