The Cão de Fila de São Miguel is a cattle dog, which originated from the São Miguel Island in the Azores near Portugal. The breed is a natural guard dog and requires a firm leader if meant to be kept as a family pet. Filas do best when giving a job to do. They are known for creating a deep bond with their owners and for being extremely gentle and receptive to the families. They can be aloof and defensive with strangers.