
This is absolutely normal behaviour . It is called mouthing and will lessen when the baby teeth start to fall out.
I am surprised you say that the puppy wouldnt do aything that your wife asked- its 10 weeks old for gods sake?!! :(
Do you expect ANY breed to be trained to command at this age???
I am really
shocked that you are thinking of rehoming at such a young age and with no real effort put in . How long have you had the pup ?
I have a Staffy who is now 14 months old and he went through the biting phase and my last staffy also did the same at that age . It is not ust staffies that mouthe either!!
It is
NORMAL , it will cease ( keep saying NO) and it doesnt mean you have an aggressive dog by the way. Sometimes when you shout at the pup while he is doing it , it can cause him to become overexcited which will explain why he may sometimes jump or lunge at you. He is only a baby and you need to either put him down in his basket or ignore him for very short periods ( like 5 minutes - no longer) .
Plase what ever you do -
DO NOT MUZZLE A 10 WEEK OLD PUPPY :(
Dogs only require muzzling in extreme circunstances and this DOES NOT warrant it :(
As for lockjaw thats absolute garbage - did ou do any research into the breed before you chose pup??