The Fila Brasileiro:
See my post on the ojeriza temperament for exactly what I’m talking about.
This temperament makes sense in parts of Brazil, where the crime rate is insane.
In America, it’s a lawsuit on four legs.
Very few people think it’s such a great idea to breed for super aggression, even breeders of protection dogs.
When this level of aggression becomes the defining characteristic of the breed, you have a problem.