experienced dog owners or dog fosters - like D'Elle and JohnLloydJones
As with JohnLloydJones, I advise adopters not to go too fast with 'socializing' the dog, but I think sometimes this verbal advice goes in one ear and out the other - particularly when they may be focused on the dog they are about to go home with. Having an essay that can be read at a quieter time, and perhaps re-read as needed, might be helpful.
While I have fostered a dog or two, I make no claim to being an expert. I have, however, learned a bit about both dogs and the people have adopted them. Verbal instructions may "go in one ear and out the other", so I usually followed up with an email or two containing advice that was customized for the particular dog/people combination. Obviously some matches were such good fit that little extra guidance was necessary. In other cases weeks of follow up by the rescue were needed.
I know some rescues talk about the "three threes": three days, three weeks, three months. These are the (somewhat loosely defined, lengthwise) milestones of a dog's adjustment with it's new environment. The first period -- three days -- is where decompression, where needed, plays its part.
Back to the webpage you suggested. My discomfort with the advice given boils down to the page concentrating on establishing control over the dog. Well yes, we do need to be in control, but I cringe when I read:
"Do not allow your new dog to “go ahead of you”. Establish this rule right away. You go out and in FIRST through the door. In fact, it is a good idea to have them sit before they can enter, before you leash up, etc.
" This is run-away NILF. You control the door; you open it, you close it. Who goes through first really doesn't matter, as long as you control the door* itself. Train a boundary command (e.g. Wait!) by all means, but why worry about who goes first? [It may come as no surprise that I work on the boundary command (Wait!) and recall (Here!) right from the get go. I don't bother much with Sit! -- the dog can stand, sit or lie down for all I care as long as it doesn't go running off into the distance!]
Another thing I do differently from the webpage advice is bring a new dog into the existing pack as soon as possible. By walking together (on a coupler) with an experienced dog, the new comer learns the ropes very quickly. It also learns its territory, which means if the dog gets loose, it is far less likely to ran far away, because it has learned its local area.
Note*: Ah Rudy! Ex-foster Rudy! He who could open wire crates from the inside, open doors and "drum roll" open the dead bolt latch of a main door to let himself out. His innocent looking face and diminutive stature concealed a giant personality. He never let physical restrictions limit his actions.