Are  Great Pyrenees and Terceira Mastiff both dog breeds?
Great Pyrenees: The Pyrenean Mountain Dog, known as the Great Pyrenees in North America, is a large breed of dog used as a livestock guardian dog. Terceira Mastiff: The Terceira Mastiff (Portuguese: ] ) is a landrace Portuguese dog breed, also known as the Rabo Torto ("rabo"=tail, "torto"=curled/twisted).
yes