The picture says it all. This is the laziest breed of small dog I've ever seen. They also aren't the brightest bulb in the closest which helps because they don't get bored/frustrated. I have 2 Chinese cresteds and they are the biggest couch potatoes. Other than barking when someone rings the doorbell, they just lay around. In addition to being lazy, they are pretty low maintenance. No haircuts, just regular bathing, teeth cleaning, nail clipping.
About getting an older rescue: both of my dogs came to me as adult dogs. Neither were potty trained very well. Also, they had not been crate trained or were abused/neglected when it comes to crates so they freak out at the very sight of them. It's been a lot of work.