I like a hide and seek game for a few reasons. First of all, most kids and dogs love it, and it's a great way to condition your dog to come when called by all members of the family. You start off in close proximity, then as your dog understands the game, your child can begin to hide. The most important part is to have a treat for the dog when he locates the child. I've heard that more and more vets recommend brushing your dog's teeth.
Early grooming is important for all pups.
The younger the better. I always try to get my puppy to feel comfortable about being handled. Always be gentle and use food treats as a reward. If your puppy fights you, hold him firmly and try to calm him with a soothing tone of voice. Do not release him when he struggles because soon he will learn that fighting will win his freedom.