What breed is this dog?

This is Storm. She walked up to the door of my stepfather's family house in the country(so she probably came from the woods somewhere behind their house) and has been with his brother ever since. My mother and I were talking and we realized her feet are gigantic. She adorable but has a lot of "wolfy" features. Can you help me find out what breed she is. It's not my dog so its not like I can take a DNA test. She has excellent temperament, if it matters, where she is usually extremely calm unless she is playing. And her teeth are razor sharp. She nibbles when she plays but even that still hurts.