How I got my pup to understand biting was a no-no: I took his mouth and closed it gently. I told him NO in a quiet, but stern and controlling. I held him like that for only three seconds, and let him go. I continued playing with him, and if he bit me again, it was closing his mouth the same way, but tapping his forehead firmly with three fingers. Remember, when punishing a dog, less is often more! More punishment could make your dog scared, or even aggressive. Never hit your dog hard, but firmly "spank" it to let it know you do not approve of the certain behavior. Also, try to assert a firm, and dominant energy. Your dog can sense if your serious or not!
Don't yell or become violent. That's a good way to lose their trust or make them become violent in the future. My dad did that to one of our cats and we had to get rid of the mean little booger. What my friend does with his pets, is that he gets a spray bottle and he spritzes them with water and says "No" in a stern, calm voice. They eventually learn.
tell him no clap your hands making loud noise. NEVER HIT YOUR DOG. it will make him hand shy or worse. he needs to get used to you ansd learn the rules of the house. Think how it feels being taken from mommy to a strange new land. How would you feel? scared? when he pees and he will in the house .......same technic. put his nose to the accident. tell him NO slap your hand w/ a rolled up newspaper or magazine to make a loud noise. put him outside. he'll get it in a few days. Dogs understand fair and unfair. be fair and he'll be a good dog.
Puppies bite as part of play with each other, so they try it with humans too. Tap it LIGHTLY on the nose and say NO in a sharp but not overly loud tone. Push it away for a few moments to emphasize disapproval of biting. This has always gotten through to puppies for me.
It's normal for puppies to bite. Whenever it does something you don't like, point at it and say in your deepest voice "No." If it persists, smack it on the nose. But remember there are rules: if your puppy is doing something not-so-bad like not coming when you call it, just carry it and say sternly "Listen to me". If it does something kinda bad like bites your hand for a treat, smack it lightly. Only if it does something very offensive like biting you roughly do you smack it hard. And if it bites you but is just playing and doesn't understand you can be hurt, try to give it some slack.