Biewers = pure joy, love, and awesomeness!!!!
They are NOT mongrels (I'm of the opinion that NO pup is a mongrel... that just sounds mean. If you must call non-purebreds something, mixed breed would be more appropriate).
Biewers come out of Germany. Here is a link to the American club's website that explains more about them:
Biewer Terrier Club of America, Inc.