Ok lets try to get this cleared up Fila Brasileiro's are an old breed from Brazil, they have been around since the last half 1600,s. They are not just a mix of Bloodhound and Mastiff like some people want you to believe. A true Fila Brasileiro can trace its blood lines back to Brazil. Some dumb ass americans
that didn't have the money for true Fila's started breeding mix breed Bloodhound/Mastiff crosses, and selling them as Brazillian Mastiffs, and people that have not researched the breed fall for this.
This being said the Fila's true ancestors were the War Mastiffs that had a high prey drive aggressive nature and were very protective and highly trainable,from these dogs is where Fila's got their size and massive build and intelligence, next was the St. Huberts Hounds which are the ancestors to the bloodhound.They also where more agressive than the Bloodhounds of today,the animals that they hunted then where alot more dangerous and the enviorment in general was much more wild than today, this is were they got their tracking ability and loose skin hanging flews and dewlaps.Next was the true old Engelsen Doggen, the ones that were breed to be strong,atheletic working dogs with tenacious personalities that never gave up,this is where Fila's got there top line from, being higher in the hind quarters snd more massive in the chest, they inherited its aggresive temperment, and tenacity. Next came the Fila Terceirense a herding dog,this explains the cattle herding ability of the Filas and their protective nature around stock.
Unlike the OEM which had nearly gone extinct during WWII then brought back and bred for size and what I would call very mild temperments, True OEM breeders do not breed for aggressive behavior in their dogs and a dog that shows aggression is usually spayed or neutered. Bloodhounds of today are still great tracking and hunting dogs, some lines are more aggressive than others. The Old English Bulldogs of today are nothing like the Engelsen Doggen of the 1600's. The Fila Terceirense are all but extinict, though some lovers of the breed are trying to bring them back. As you see Fila's are a far cry from todays mix breed Bloodhound and Mastiff. So be smart If you want a Fila Brasileiro research the breed talk to good breeders that care about the quality of dogs that they are breeding. There are a few GOOD breeders out there if you research.