we've had him about 2 months and he's lovely BUT he bit our babysitter last week - didn't draw blood. we had left 10 minutes previously and she raised her hand to stroke him, he went for her arm.
Then yesterday a friend came to visit, dog was in the front garden, started barking, as i went to get teh door, saw our friend offer his hand for dog to sniff and the dog just bit it! again didn't draw blood but there was no hesitation at all. I think he thinks he's protecting us.
I think we have to rehome him, altho i'm gutted to have to do so as we can't risk him biting DS1 or DS2 or one of their friend.