What primary factor served as the unforgiving crucible for the Fila Brasileiro's development?
Answer
The harsh, demanding environment of the New World.
The breed developed over centuries in Brazil where the harsh environment, including jungles and the presence of wild animals, demanded unparalleled guardianship capabilities.

Related Questions
What primary factor served as the unforgiving crucible for the Fila Brasileiro's development?Which trio forms the most commonly cited ancestral foundation for the Fila Brasileiro?What does the breed name 'Fila' derive its meaning from?Which Iberian breed is sometimes cited as an important contributor to the working lineage alongside the core trio?Who was instrumental in establishing the first breed standard for the Fila Brasileiro in the mid-1940s?What specific coat color appeared prominently following the alleged crossbreeding controversy in the 1970s and 1980s?Which breeds were allegedly introduced into the CBKC registry during the later controversy that caused concern among preservationists?What organization was formed by dedicated preservationists to return to and preserve the original phenotype and temperament?What specific characteristic does the CAFIB standard explicitly reject as a sign of modern crossbreeding?What component of the common ancestry theory is suggested to be negligible or nonexistent in one competing theory emphasizing Iberian purity?