Holly, a 10-year-old girl, wakes up one Christmas morning and, feeling disappointed after receiving a pet rock as a present, decides to build a dog out of snow. To her surprise, the snow dog comes to life, and Holly names him Snowbert. She spends the morning playing joyfully with her magical companion. However, as Snowbert grows larger, Holly realizes the responsibility of caring for a dog, especially as he begins causing chaos in the neighborhood. Eventually, she learns her lesson and manages to destroy Snowbert before anyone notices all the damage that he caused to the neighborhood.