The Alentejo Mastiff bloodline can be traced back to some of the first dogs to be brought to the Iberian Peninsula by humans migrating from Central Asia. Although exactly when the dogs arrived remains shrouded in speculation, it is known that for a very long time these dogs were used for sheep herding work in northern Portugal. With populations of larger predators diminishing and other changes in the way livestock raising and agriculture were operated, the popularity of the breed would decline as well as their numbers. Although the Alentejo Mastiff population remains fairly low compared to other breeds, thanks to some dedicated enthusiasts the breed has been able to survive into the modern day. Today it is more common to see these dogs living in home settings than to see them out working. They may not be in high demand as working dogs anymore, but their loyalty and calm demeanor make them a beloved pet for those looking to bring some more love into their home.