Teaching a puppy to modify his mouthing behavior is an opportunity to teach him bite inhibition. Bite inhibition refers to a dog’s ability to control and inhibit the force of his mouthing. A puppy or dog who has not’t learned bite inhibition may not recognize the sensitivity of human skin and bite too hard, even in play. 
Most owners wait until a bite just "happens to occur" before trying to deal with it and are therefore totally unprepared when it happens. Then they do all the wrong things, thus making the problem worse. Learn the proper methods to prevent and stop dog biting.

Most dogs don't understand if barking is something good or something bad. Sometimes when the dog barks it goes ignored or the dog is encouraged if it's at a time when the owner feels it to be necessary. At other times the dog is yelled at. The inconsistency doesn't provide correct Bark Control. Humans are consistently inconsistent, so in order to help your dog know the proper Bark Control rules, teach him what they are.