Train your dog with a wait command before going through doors, big dogs that try to barge their way past you out of excitement to get out the door are sort of cute but also incredibly annoying it can honestly hurt someone who is frail.

If it is a young dog you trust and you are raising them, touch their paws lots. Pick their paws up and shake em like a hand, don’t be rough but just handle their paws so they become comfortable with humans handling them as dogs can be really nervous about this and it makes it extremely hard to inspect your dogs paws for a cut that is making them limp or something.

similarly if you are raising a dog and it is too small to hurt you, when you feed your dog hang out next to their dish, put your face near theirs (ONLY with a dog you trust), give them pets, make your dog used to the fact that humans might come near their food but that humans won’t take away their food so they don’t need to be defensive.

the more dog time you give your dog (where you do dog stuff with your dog) the more human time your dog will give you (where you both do human stuff and behave according to human norms). Going on walks, throwing the ball, rough housing, all of these things give your dog the mental stimulation they need to relax and behave

a good dog park where your dog can socialize with lots of different dogs and learn their doggy language is not only a fantastic way to get your dog exercise it gives your dog the opportunity to practice interacting with other dogs.

periodically (gently) surprise your dog by nabbing their tail and giving a tiny tug, or poking them a bit on their rump when they aren’t looking. BE GENTLE and always transition to pets and praise after the initial surprise moment for your dog. If you have a large dog and some kid gets loose and runs up behind it and yanks your dogs tail for no reason or otherwise entirely takes your dog off guard, your dog will be used to this kind of bullshit and simply be surprised it is a tiny human annoying them rather than a full grown one.

if you are raising a dog and you can figure out a way for your dog to meet cats, it can be helpful so that they don’t meet one in a situation you need them to behave and they go “WAIT WHAT IS THAT”. Same thing with human kids and babies.

going away for the weekend and leaving your dog with a friend or someone else’s care is actually a really good thing for dogs that tend to get super attached to their owners (german shepherds are a classic example) as it stretches their mind a little bit encouraging them not to see their owners as the only thing in the universe, it gives them experience trying to relax without needing their One Human.

get a collar that helps with walking better than a normal collar that just chokes out dogs when they pull, if you get the right collar/harness it will feel like you are walking an entirely different dog

big dogs can absolutely learn how to “be mouthy” while also being incredibly gentle even though they have a mouth full of knives that can crunch through bone. Remember, dogs will carry puppies by their scruff. Dogs like humans have to learn the language of play, and they have to learn when they are being too rough with their mouth when they play with you. Many people train their big dogs to NEVER be mouthy which is understandable but if you know what you are doing your dog can absolutely learn how to play wrestle with you on the ground with their big scary mouth “chomping” (extremely gently) on your arm and both of you going at it having fun and being careful not to hurt each other. A dog can also be easily trained to get the signal for “ok playtime is over now, let’s wind down this energy” or “this is not the correct social situation to go nuts and want to play”.