Dominance?

Pepper is now 16 weeks old. I am his primary "caretaker" i.e. feeding, "bathroom visits", etc. I am also his primary disciplinarian. Lately, I have noticed that when I try to correct his inappropriate behaviors, he responds by growling & at times showing his teeth!! My method of correcting him is to clap my hands to get his attention & then say "NO" in a firm voice. I do at times point my finger which may be the "problem"?? This doesn't happen all the time, but has happened on at least 3 occassions. Any advice? Is this "normal"? Is this fear on his part or his this his attempt to scare me?? Quite frankly, I have had a fear of dogs since a child & although I do not fear Pepper, I wonder, if I am somehow giving him that sense??
Lydia/Pepper

• Try making little Pepper look you in the eyes as you correct him. He is testing you. Be stearn and always follow thru with correction. I have had 3 puppies and one has always had a problem looking me in the eyes. He does not want to mind.
  Cheryl