This afternoon I had potential tenants coming over to look at apartment #3 (2br, hdwd flrs, util. pd., free rat rmvl.), and just so they didn't meet my enthusiastic (well, vicious) dog Billy Bob prematurely, I shut him up in my office.
Vicious: behavioral training (above) hasn't helped.
When I ran back upstairs to let the idiot out, my office door was locked. Billy Bob does not paw at doors. He locked it just to spite me. Had to get a hammer and pop the hinges (yes me, not him--he's better with fine tools) to get him out.