The Possum Pinscher?
I've discovered that Harlequin Pinschers, like possums, scream at their own ass. Unlike possums, the Harlequin Pinscher's scream would drown out the sound of a .45 going off next to your ear.
I have too many possum pictures than whats good for me. The min pin above has not had its mouth altered. I lazily cropped the body because the head and jaw were almost identical to a pic from my collection.