Our dog is a fully grown black lab who we got from rescue less than a year a go. We don't think he'd ever been in a house before and he definitely had no proper socialisation so he still thinks he's a puppy, but being a fully grown Labrador we had to decide on quite strict rules and stick to them straight from the start.
Some rules he has picked up straight away, some we're still learning but are strict with it.
He sits and waits for his dinner and he doesn't touch it until he is "released"
He stays on his bed while we are eating
He doesn't jump on anyone but especially not the kids
In his crate overnight and when we are out (he loves his crate and takes himself off there at 10.30pm on the dot for bedtime)
No going in bedrooms, we are a single story house though so he's quite happy laying in the hallway outside bedroom doors if we're in there. He particularly like resting outside the dc's bedroom doors as they are opposite each other so he can watch them both at the same time.
5 mins in his crate to calm down if getting too excited
We have a boundary line in the lounge that he isn't allowed to cross, this is the dc's safe spot where they can read/play Lego without worrying the dog will jump on them/steal Lego etc. The dc can play with the dog in the rest of the room if they want.
No going into the kitchen but that applies to the kids too, it's a small kitchen and I hate people/dogs under my feet
Sit and wait at doors until given a cue to come through (more for safety)
Not allowed on sofa (shedding but also because the sofa is in the kids "safe space" so he can't get to it anyway)
No begging/scrounging/human food due to his allergies
No pulling or lunging on lead, has to sit next to me and wait if other dogs are walking past, he gets far too excited and loses all his manners, he's also still too boisterous with smaller dogs
If not on short lead, always on long lead while we continue recall training. He's allowed off lead for a play with a certain group of dogs if we bump into them (guide dogs in training, owners happy to help me work on his recall around other dogs by letting mine play with theirs)
It probably sounds strict but he is now turning into a amazing family dog considering his life before coming to us, he is very loved and gets lots of attention, walks, training sessions, cuddles and treats.
The rules for the kids around the dog are just as strict.