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. Its shorter coat is well adapted to the region's warm dry climate. In the right environment they are very effective to protect an estate and flock.