i have a 9 week old puppy who i want to teach to not jump up and be gentle by not biting (play bitting or aggresive bitting) i know puppies play bite but i want to teach him from a early age that he cant as i have neices and nephews who will come over and i dont want him to be jumping up and play biting. he will be a big dog and will most likly knock them over when jumping up. he is very pushing at the moment which im teaching him not to be.

one nephew is nerouvs around dogs that jump up and bite or nip etc

also he gets jelous every time anyone touches pats or picks up our other dog. he will push through to us and start biting. i tell him off but he always does it. how do i stop this