Maybe to take the stress away for you as an owner I would suggest purchasing a soft muzzle.
They are made of really soft nylon and inhibit biting, barking and chewing but the dog can
still drink..... We have just taken on a rescue greyhound and with 4 cats running around I
had to be sure I could trust 'Ice' with fluffy ragdolls...
If you tried this with your cute little dog it would take the worry away for everyone just in
case he snapped to start with. At least at 4 mths you've got an easier job than with an
older dog - especially a greyhound who'se life has been one of encouragment in chasing
fluffy things....
Hope this is of some help to you and your dog especially such a gorgeous small dog and
quite irresistable to children I'm sure.....