Nipping...
I have the same problem, I think my Yorkie is teething...I got her chew toys, I put her in her pin to punish her, sternly say "NO"...but she acts as though she doesn't understand.
I will have to use the tin can trick see if that helps! Some one told me to try getting a baby teething ring for my puppy, or freezing a wash cloth for her to chew on? Have you tried any of these yet? I am to the point I would try almost anything!
Lily (my puppy) won't even use training pads either. How did you get your to use them? Sometimes she goes outside but that is only when my bigger dog has to go outside!