Well, Pro.... hummm. What if you rescue an older dog, not a puppy? One that doesn't need all the series of puppy shots, can get the one-and-done deal. (Yes I am playing angel's advocate here, snicker!) And not a flight risk, can't find little holes to get out of. ... and already house-trained, maybe. We got our Sammy at 15 months and yeah, he had some issues and needed some work but at least we weren't doing the house-training every 2 hours with him and we now have a very nice companion for The Kid!