But in the meantime, until your dog is obedience trained, there is a method I've used for over 15 years and is very effective and not cruel for a dog that jumps on people. It cures even the most stubborn large dog. However, everyone in the family will have to be consistent until he learns it is not acceptable.
What you will be doing is putting one knee up to waist level any time you see the dog start to jump up. Put it up before the dog is close to you, so he sees it. YOU DO NOT KNEE THE DOG. Instead you put your knee up long before he reaches you and he jumps onto your knee generally hitting himself in the chest as a result. Since your knee is up and you aren't moving when it happens, he does not interpret it as something you are doing. At the same time you need to say in a low toned firm voice, NO JUMP. He'll learn that when he jumps, he ends up hitting his chest and will associate NO JUMP with that feeling and learn to not jump on people. He may still dance around on his hind legs, but they do usually learn not to touch the person. Again, I want to stress that the knee should not be used to hit the dog, but instead let the dog run into the knee.
Your dog may try and come at you from the side which is likely what he is doing, but just shift position until he learns that he can't jump. You should also start teaching him that he will not get petted or get treats or affection or even talked to unless he is calm and he works for them by sitting or laying down. They also make no jump harnesses that might help as well. See one here:
Now for mouthing, it can be a little more tricky as he is older. I'd be inclined to wear some leather gloves for this part since he is an older dog. There is a method for stubborn biters but it should be used as a last resort. You can stop mouthing and biting hard by going the opposite direction. Instead of taking her hand out of his mouth, put it further in the mouth. DO NOT do this meanly (not that she would). Do not do it quickly or shove it in too far, just move it further in enough that it makes him uncomfortable so that he pulls his mouth away from her hand. He will learn that putting his mouth on her hand results in the hand going further in and possibly triggering a gag reflex which he will not find pleasant. I'v found that this methods works on the most stubborn puppies and young adults.
I think I've given you a few different things to work on. It is going to take pretty much all of them to bring him under control but it will be worth it. Definitely get the training started so he will be trained before babies come as there is extra training he'll need then to ensure the babies are safe around him.
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