...Then there's the story of the yokel who named his dog "C'mere!!"…
Seriously, though, about "no": when I was reading about dog training and raising, while I was searching for my perfect breed, I settled on the the school of Positive Reinforcement (ala' Karen Pryor). This was years before I found Kiba's breeder, and I read a LOT of books, watched videos, and searched dozens, maybe hundreds of websites. I was determined to raise the best, happiest, well-adjusted dog I could! Truly fanatical, positive reinforcement oriented trainers don't say no. They do NOTHING that would be construed as "negative" If a dog makes a mistake, re-direct without comment. This made sense to me, and I decided this would be the way Kiba was raised, when I found him!
Of course, reality is a bit different than theory in books. When your puppy is madly dashing out the door towards traffic, you tend to forget all your good intentions and yell your ass off! But I try. I have discovered that some sound of disapproval, or attention-getting, is needed on occasion while raising a puppy. I use "Uh!" or "Uh, uh!", but regardless of which sound we use (no, uh-oh etc.) they all mean basically the same thing: Stop that! Dogs don’t care WHICH sound it is (despite evidence to the contrary, dogs do NOT speak English! [Or whatever language is spoken in your homes]), and “No” tends to be the one we choose to indicate disapproval or error.
This can be confusing for a dog. Why should they stop? Dogs are not moral creatures, and it's very difficult to explain to them WHY they can't chew on your shoe, when it feels so good to them! It's been proven that it is easier to give the dog SOMETHING ELSE to chew on, and praise him for chewing on THAT item, rather than trying to convince him not to chew at all (which can’t be done. Dogs NEED to chew!) This is redirection. With diligent repetition, and lots of praise, eventually the dog CHOOSES not to chew the shoe. Amazing!
Think about when, and why, you say “No” to your dog. What is she doing that you want to stop, but instead of just stopping her (which can frustrate a puppy, and cause MORE acting up), think “What ELSE could she do instead, of which I would approve?” Try NOT saying “no”, and praise her instead for changing to the desired activity. Instead of thinking, “I want her to stop XXX.”, think “What else would SHE like to do?” Or even better, “What is she getting out of that activity that I can satisfy in another way?” It makes life much more pleasant, for you AND your dog.
Puppies nip, bite, chew, and generally gnaw on anything they can get their hands, er, teeth on! They seem to especially love to chew on us! This is a play behaviour, as well as a teething behaviour, and you can't stop it. But you CAN give her better choices. This is also the time of her life for her to learn bite inhibition. If you don't know what that is, I suggest you get a copy of Dr. Ian Dunbar's book "Before and After Getting Your Puppy". I don't know if he was first, but he certainly described it best, and he offers the best method for teaching this vital lesson to your pup. You can't teach a dog not to bite. Dogs bite. But you CAN teach a dog how hard she may bite in order to make her point.
If a child trips and falls on your dog, the best reaction she can have is to move away. Or she may yelp, and move away. She may make a move toward the child with her head, or may even snap in fear and pain. But without bite inhibition this scenario could end in a tragic disaster. Puppies need to be allowed to bite and chew, but they need to learn limits. This starts with their mother and siblings. An important reason that I advocate later adoptions (at around 12 weeks) is because the pup learns bite inhibition by playing with his mother and siblings. When he bites the mother too hard, what does she do? She yelps, moves away, and may even snap back at him! While I would NEVER advocated biting your puppy, yelping and moving away from an over-vigorous puppy teaches him a valuable lesson, “That HURT, and I’m not going to play with you anymore!”. Dr. Dunbar explains this much better than I can, so check out his book, if you can.