These dogs were the result from mixes of Bullenbeisser and other similar breeds. Bier (beer) probably refers to the Biergarten, the typical Munich beergarden, an open-air restaurant where people used to take their dogs along. The nickname 'Deutscher Boxer' was derived from bierboxer and Boxer could also be a corruption of the former or a contraction of the latter.A passage from the book 'The Complete Boxer' by Milo G Denlinger states: About 22% of puppies die before reaching 7 weeks of age.