How do I train my 9wk old rottweiler puppy not to bite and nip our hands, arms, feet, ankles and toes? It is painful as she has very sharp baby teeth.

Don't hit her or swat her. That will confuse her and make her more aggressive to defend herself or make her scared.

Also, don't play with her in a rough way so that she gets the idea that sometimes it's okay to bite. Dogs don't understand differences in how to behave.

If she nips or bites, say "No!" in a sharp, loud voice. There are other training tricks, and since I am a cat person, I will bow out at this point and let the dog people take over.