The Bullenbeisser became extinct by crossbreeding rather than by a decadence of the breed, as happened with the Old Time Bulldog, for instance. The size of the Bull Biters varied from about 40 to 70 cm by 1850; the smaller lived from what today is Netherlands and Belgium, and the bigger, in Germany. In the late 1870s, German breeders Roberth, Konig, and Hopner used the dog to create a new breed, today called the Boxer. Some 30 Bullenbeissers were already crossed by the Boxer Kennel Club of Germany at 1900 in with Bulldogs brought from the British Isles. The blood composition was 50/50 at that time, however, the German owners started crossing their dogs with all kinds of Bulldogs and Boxers, which produced an undistinguishable breed after the World War II. One reason why such quantity of German blood was used to create the Boxer dog was the wish to eliminate the excessive white colour of the breed, and the necessity of producing thousands of dogs for one of the most popular breeds in the world.
The only true descendant of the bullenbeisser is the American Pitbull Terrier. The Boxer is descended about 70% from the Bullenbeisser. The Great Dane was originally a mix 50-50 English Mastiff and Irish wolfhound with later additions of dalmatian and German pointer. The Banter Bulldogge is a very good recreation of the breed. However, the Bullenbeisser was in all its aspects almost identical to the present Spanish Bulldog and very alike to the Dogo Argentino, not only in aspect, but also in usage.