Labs have extremely high pain tolerances. That's what makes them such good family dogs. It's because they can withstand a LOT of pain and they do it happily. Slap a lab? Get licked/wagged/panted on. Slap a smaller dog? Ehh... not such a happy response. That's why families with small children are so often recommended Labs- because there's less chance of the dog being hurt by the children and vice versa.

As for your pup, train what he lacks.

If he's not completely okay with strangers, use the touch desensitization training with strangers. Have a close friend or family member come to your house and just spend a couple relaxing hours working on that. If he's not completely okay with your husband, have him use the touch desensitization.

Rules and schedules are very important. Lay down some rules now, and teach your pup to be a confident, obedient dog. Remember, he's always learning, so always keep teaching!