I'll give a few more hints...the other name starts with an X. The name with the word farm in it starts with an M. This dog is very rare, it's used for tracking and herding, guarding, and livestock purposes. It is a mastiff-type breed. It is medium size, has short hair. TONS of energy.It originated in Potugal. The name of the city it originated in is in it's name. It is not recognised by anything. It is very intelligent and well-mannered.

Is that enough info? I can't find any more pics of the breed...It's very rare.