Hello Eric, when i walk my 10lb puppy at the mall / public road, he would keep on pulling (would pull ahead of me and I have a tough time keeping him 'next' to me / to 'walk' with me)... When ppl approach him trying to pet him (he would do the same to me sometimes), he would get very friendly and bite (in my opinion) 'sometimes' too hard. How do I teach him not to do so?