The formula Antonio started was:
• 1) the Fighting Dog of Cordoba, to which he added blood from
• 2) the Pointer to give him a keen sense of smell which would be essential for the hunt.
• 3) The Boxer added vivacity and gentleness;
• 4) the Great Dane it's size;
• 5) the Bull Terrier, fearlessness;
• 6) the Bulldog gave it an ample chest and boldness;
• 7) the Irish Wolfhound brought it's instinct as a hunter of wild game;
• 8) the Dogue de Bordeaux contributed it's powerful jaws;
• 9) the Great Pyrenees it's white coat and
• 10) the Spanish Mastiff gave it's quota of power.

The brothers gathered ten Cordoban bitches as their nucleus and began bringing in the first of the contributing breeds as studs until the early offspring showed promise in the desired direction. At a certain point in the program they had as many as thirty bitches in their care. This undertaking would not have been possible for two young men still in school had it not been for the help given them by their family and friends of their father. The senior Martinez hired a kennel man to care for the dogs while Antonio and Agustin were in school and the brothers spent all their pocket money on food for the dogs. They were also helped by food donations given by their father's friends. Such help was gladly accepted by the brothers in those early years but the dream and the plan on how to make it a reality was Antonio's. His was the genius that guided the program and Agustin was always at his side. Later in life when Antonio became a respected surgeon, his medical knowledge improved and refined his dream. He wrote the first standard for the new breed in 1928.