I think those are all awesome tips! Here are a few things that helped us with Kyara's mouthing and play barking.
1. To reinforce that we want him to not chew on your fingers:
One thing that helped a lot with Kyara's mouthing was a little exercise I would do using the clicker (if you don't have one just either say a YES to mark the behavior you like).
The exercise goes like this:
When the puppy is calm, sit in front of him with plenty of treats and your clicker.
- Put you hand in front of his nose and as he looks at it click and give him a treat.
- At the beginning you click the simplest behavior (looking at your hand could be sufficient, then touching it with nose - basically anything except mouthing or biting) just to try to associate not biting your hand = puppy gets treat.
- And then you move on by letting your hand in front of him longer before clicking and treating.
If he starts to mouth move down a step by leaving your hand in front of him for a shorter amount of time. Also when he mouth use the yelping or ouch sound you use when he bites on other occasions.
Do a few of these sessions each day for only a couple of minutes each time. Always end the session on a good note, if he bites, move down a step where he didn't bite and then stop the session maybe play a bit with him after with a toy or something to associate that after this exercise it's fun time!
2. To direct the mouthing to something else:
Whenever Kyara was chewing on something she wasn't supposed to we would say a firm NO (or a yelp if it was our hands) and then we would give her one of her chew toys and praise her if she started mouthing it.
This truly worked like a charm. Like romeosangiovese mentionned, puppies don't know what is Ok to chew on so you must teach them. I can now leave anything on the ground without worrying that she'll chew on it. She understands what toys are hers.
3. For the play barking (note: not for the barking on a walk, we are still working on that lol):
What worked for us was simply stop the playing and ignore the barking. At first it would take a little while for her to give up but slowly the barking started to disappear.