The Cão de Gado Transmontano (Portuguese pronunciation: ) is a giant dog breed of molosser type, and primarily a working dog used as a livestock guardian. Originating in the region of Trás-os-Montes e Alto Douro Province, Portugal, it is a rare breed mostly confined to this area. They are highly trainable and responsive to positive dog training techniques. They do not respond well to punishment, and have 'a long memory.' They are high energy dogs that require a lot of space.