http://www.apbt.online-pedigrees.com/public/printPedigree.php?dog_id=1999 This is the Pedigree of one of the best stud form Pat Patricks yard, Gonzale's No Regret Very famous dog...Narrow Cross Program and some Wide cross probably because the 3 lines involved had combination capacity.If you search all generations you will see, sometimes a alien blood probably when ht vigor comes down In the pedigree you can see in the fourth generations 4 champions Sire: Indian Bolio Indian Bloomers Dam: Indian Bolio Grenwwod Oakie But just after 2 generations you see anothers champions : Indian Mister and Frank Kenia(Hard Bite) And finaly Gonzales No regret. (Hard Bite) Hard Bite is not a feature the pass easily because its many genes involved, unless tthe dog came from hard bite line like No regret. In the same pedigree back to 30's You can see another case: http://www.apbt.online-pedigrees.com/public/printPedigree.php?dog_id=881 A famous dog Hard Bite and with unusual Head Conformation CORVINO'S BRADDOCK (14XW) come from a Wide Cross.In fourth generations you can see just unrelated genes , diferents lines.In those times the dogs had been still imported from Europe. In the second generations you can see TAYLOR'S BUGLAR with blanck pedigree .Could be a alien blood? to add vigor? Who knows!from sire is very knowing dogs from Armitage/Colbys strain all with small heads.