We used to have a little corner LGS with a sign in the window that read "Forget the Dog, Beware of Bird!"- and there was a giant, uncaged Cockatiel on the counter with a little perch, a water bowl, and some toys. He pretty much had free reign of the shop and would even talk a little bit.
There was an old hound dog who would lay behind the counter napping all day.
The story went that the shop got robbed a few years prior at gunpoint, catching the proprietor unawares. Unfortunately for the perp, he stood a little too close to the birds roost when he drew on the owner and the bird, sensing his buddy in distress, took off a goodly chunk of the baddies ear wih his beak.
This gave the shop owner time to draw his own gun and put two slugs in the scumbag, ending his life of crime permanently.
All ended well, except that the bird was traumatized by the experience and would occasionally blurt out "Give me the money!" to the chagrin of the otherwise extremely grateful shop keeper.