What is the best way to judge how well a dog behaves, their activity level, and how much care they'll require?

I've been sitting through Rover since August of 2021 and have done a meet and greet for almost every single sitting. These meet and greets for the most part are very helpful. Unfortunately, I have noticed that some owners, especially a couple I've had in the past month, don't seem to be particularly honest about their pet's activity level, general behavior, and amount of care required. When I go to the meet and greets the dog can seem sweet and fairly well behaved but during the sitting be extremely wild, rambunctious, and plain out of control. I realize some of this difference can be contributed to the fact that in their eyes I'm not yet seen as alpha, seperation anxiety, and other related factors. However, the difference between the dog during the meet and greet as well as what the owner says can be so different from the dog during the sitting that the listed factors simply can't account for all of it. This then leads to the question, how do I acurately judge the needs of a dog when owners aren't always truthful about /undersell the needs of their dog? Please take into account that other owners seem to do the opposite, perhaps unintentionally, and make their dog out to be way worse then they actually are.