I can't stop my pug puppy biting.?

I have a 10 yrold Pug named Nikki. Or as I called her pudgy pie. They are very nippy when they are young and it is just cause she sees you as her play partner. Just stop when she does it and walk away. She is trying ro dominate you and you must be the Alpha if you ever going to have any control over her. They are more stubborn than bulldogs and even harder to train the good thing is that they are easy to potty train.