Husky Puppy!

Has anyone owned or own a husky puppy before? I need some advice with mines. Hes 12 weeks and every time I walk him he attacks my shoe or foot. It hurts a lot cause he bites into my skin. I need help I give him treats to stop and I ignore him but it doesn't seem to help. 
* I have him in class. I tell him to sit and no bite before I reward him. He listen and out of no where he bites me.