Well, that is discourse... so, let’s regroup and try again.
You didn’t really answer any of the questions. But, you did provide some interesting information which I will now use to reframe, perhaps, better questions.
You stated that you live close to and keep close contact with all the dogs you “work” to make better.
So, you’d likely have to say, that you are pretty special in that... most doggies out their, aren’t gonna end up with you... I mean, you are “there” wherever there IS... and there are more dogs than people, so, I’d be pretty safe in saying your very unique situation doesn’t cover the larger group of all dogs...
So..
Let’s try it from the hypothetical... or if that doesn’t suit you, we can just use this very article and call it hypothetical as well as factual. Covers it well.
An unknown adult doggy, given up by somebody for some reason, is A) More... B) Less... or C) No more or no less.... Likely to have risks greater than a new puppy?
Pick! A B or C.
Honestly, you pose more hypotheticals than Schrodinger.
I pick "D".
[but it's still technically a passing grade]