Are both Terceira Mastiff and Australian Cattle Dog Portuguese dog breads?
no
Australian Cattle Dog
The Australian Cattle Dog (ACD), or simply Cattle Dog, is a breed of herding dog originally developed in Australia for droving cattle over long distances across rough terrain.
 This breed is a medium-sized, short-coated dog that occurs in two main colour forms.
 It has either brown or black hair distributed fairly evenly through a white coat, which gives the appearance of a "red" or "blue" dog.
 It should not be confused with the Australian Shepherd, a similarly named but totally different breed.
Terceira Mastiff
The Terceira Mastiff (Portuguese: ] ) is a landrace Portuguese dog breed, also known as the Rabo Torto ("rabo"=tail, "torto"=curled/twisted).
 Neither the Fédération Cynologique Internationale nor the local Clube Português de Canicultura has officially recognized it.
 It is a remarkable ancestor to both the Cão Fila de São Miguel and the Fila Brasileiro .
 This breed is fully different from the Barbado da Terceira
Nature Park of Terceira
The Nature Park of Terceira (Portuguese: "Parque Natural de Terceira" , or simply the "Terceira Nature Park" (PNTER) developed from the intention of better managing the protected areas of the island of Terceira, and was instituted by the "Secretaria Regional do Ambiente e do Mar" (English: Regional Secretariate for the Environment and Oceans ), of the Autonomous Regional Government of the Azores.
 It includes an area of approximately 22% of the island classified under the International Union for Conservation of Nature's Nature Reserve designation. Bluey (dog)
Bluey (7 June 1910 – 14 November 1939) was an Australian cattle dog owned by Les and Esma Hall of Rochester, Victoria, Australia.
 According to "Guinness World Records", Bluey lived 29 years, 5 months and is the oldest dog ever verified.
 Two owners have made unsupported claims for the title in the press for Max and Bella. Francisco Ferreira Drummond
Francisco Ferreira Drummond (21 January 1796 – 9 November 1858) was a historian, palaeograph, musician and politician from a locality of Vila de São Sebastião on the island of Terceira, the Portuguese Azores.
 He was a historic publisher occupying a better part of his work with documenting the History of the Azores (primarily from the island of Terceira), where he was responsible for writing the "Anais da Ilha Terceira" ('Annals of the island of Terceira'). Barbado da Terceira
The Barbado da Terceira is a medium-sized dog, with a volumous and robust look.
 The Barbado da Terceira is the most recently recognized Portuguese breed.
 The Portuguese Kennel Club (CPC) recognized it, on a provisional basis, on November 2004; it is not yet recognized by The Fédération Cynologique Internationale (FCI).
 It is a population native to the Azores Islands, in particular the Terceira Island. Halls Heeler
The Halls Heeler was a dog bred by Thomas Simpson Hall to herd cattle on the Hall family's extensive properties in north-western New South Wales in the 19th century.
 On "Dartbrook Station", in the Upper Hunter Valley, Hall selectively crossed the offspring of Northumberland Drover's Dogs (Border Collie lineage) that he had imported, with progeny of dingoes that he had tamed.
 By 1840 he had bred the type of dog that he needed to control cattle on the massive runs that his family owned, and until he died in 1870 few of these dogs were owned and used by anyone outside the Hall family and their workers.
 However the death of Thomas Hall and the break-up of the Hall estate coincided with the development of the dog show, and an interest in breeding dogs to specific criteria or standards.
 The Halls Heeler was further developed into two contemporary dog breeds the Australian Cattle Dog and the Australian Stumpy Tail Cattle Dog.
 The name is spelled both with the possessive apostrophe, as Hall's Heeler, and without. Texas Heeler
The Texas Heeler is a crossbred herding dog found mainly in Texas.
 They are a cross between the Australian Cattle Dog, and the Australian Shepherd, but can be a cross between the ACD and the Border Collie.
 They are bred mainly for their ability to work cattle.
 Found mainly on ranches in the past, they are currently being enjoyed in dog sports such as agility, frisbee and Rally Obedience. Cão Fila de São Miguel
The Cão Fila de São Miguel (Portuguese: ] ) (frequently translated into English as the "São Miguel Cattle Dog" or "Cattle Dog of São Miguel Island", but other names, such as "Azores Cattle Dog", may be used) is a dog breed of molosser type originating on São Miguel Island in the Azores, an island chain which is one of the autonomous regions of Portugal.
 The breed was originally used for working with cattle. Australian Stumpy Tail Cattle Dog
The Australian Stumpy Tail Cattle Dog is a naturally bobtailed or tailless, medium-sized breed of Cattle Dog (not to be confused with the Australian Cattle Dog, aka "Queensland Heeler").
 The Australian Stumpy Tail Cattle Dog was developed in Australia to herd cattle, and descends from crosses between European herding dogs and the Australian dingo.
 The name is spelled both with hyphenation, as Australian Stumpy-Tail Cattle Dog, and without, and the shorter name Stump Tail Cattle Dog is also sometimes applied.