My grandparents had one that was exactly this description. They would take it out and let it run around in the back yard to do its business, then they brought it in it would run around the house fast as it could. They didn't find out until after it had died and they were rearranging the furniture that it was running behind the couch and pissing on the curtains. If the dog was actually big enough to hurt something they would have been in the news and I probably would have been missing a hand as often as that thing bit me...and we had (actual) dogs so it's not like I didn't know/like them.
I hate them. Personal reasons aligned with your comments but worse.
