"No" is the most valuable command your pup will learn, IMO. That's the
second command we taught Toto. The first thing she learned was "Good Girl"! She
loves hearing that ... always in a happy voice. We never, ever yell or raise our voice to her and it's wonderful to simply say no in a normal tone and she obeys. When potty training, I simply watched her and if she looked like she needed to go I put her on her pad and told her "Good girl" ... if she had an accident, I immediately picked her up, told her "no" and placed her on the pad. Didn't take her long to get the idea. She has never chewed on anything that didn't belong to her so I cannot speak to that problem. I would suggest that you continue to teach "No" but enforce it by doing something else that Benjamin doesn't like instead of flicking his nose ... that hurts, doesn't it?