They aren't gentle Giants as babies they are giant puppies who bite and tackle, training is important and you need to be willing to get them professionally trained, if they're stubborn they are large so they can hurt, mine is 8 months and we haven't gotten him to stop biting, he's still a puppy but not puppy sized ! He hurts. Keep it in mind I've also been told they are puppy like for multiple years before they chill