Cane Corso
Pronounced as Kay-nay Kor-so, the Cane Corso is a dog breed from Italy. Back in the day, they used to hunt, work as war dogs, and guard dogs. They are built heavily, have a large size and a deep-toned bark. Thus, they look pretty intimidating. They are born with an instinct for guarding. You must train them to obey and sharpen their natural skills.
They weigh 80 to 120 pounds and are 23-28 inches tall with muscular and large heads. They have a coarse coat having colors of fawn, gray, black. They may have a gray or black mask and small white patches.
German Shepherd
They look similar to the Belgian Malinois. They are another dog breed that is very favored by the military and the police force. They are incredibly loyal to their families. You must train them to hone their natural skills and socialize, so they are fearless and vigilant.
The breed is healthy and has well-defined muscles. Their height is 22 to 26 inches, measured to the shoulder, and weigh about 60 to 100 pounds. Their double coat is of medium length and coarse in texture.
Doberman Pinscher 
Though this breed has been thought of as aggressive since ancient times, they are docile, affectionate, and funny. They are vigilant when they sense danger and quite sociable otherwise. They need only structured training to sharpen their natural skills so that they become good guard dogs.
They measure about two feet at their shoulder and weigh between 65 to 100 pounds. This dog has a muscled body and a deep chest with a sturdy and intimidating appearance. Their short, sleek coats come in colors like blue, red, fawn, and black.
Komondor
They are known for their signature dreadlocks. Though these might fool you, the Komondor is vast and robust and perfect for guarding property and livestock. They are affectionate towards their family and suspicious of strangers. They need proper socialization and structured training.
Their height of 26 to 28 inches and a weight of over 80 pounds define them. They have a large head, a muscular body, a white corded coat, and a deep chest.
Rhodesian Ridgeback
They initially used to hunt lions and big game. They have great instincts to protect and don’t need protection training. They do need obedience training, though.
You can identify them as having a height of almost two feet at their shoulder and a weight of 70 to 85 pounds. They have an athletic body and a ridge down their back. Their short, smooth coats come in light colors of red wheaten.
Rottweiler
This is one of the most ancient dog breeds going back to the Roman Empire. They are energetic and very defensive but are also affectionate to their family. They should be adequately trained and socialized, or they could become too aggressive.
Giant Schnauzer
They are big and look menacing. Its bite is fierce, and its brak is intimidating. These dogs are very energetic, so they need daily exercise. They remain very alert when they sense danger. They have a very thick coat, and their build is sturdy.
Conclusion
As you may already know, domesticated dogs are to protect and guard their owners against animals and unwanted people since ancient times. Though almost all dogs protect the home against strangers, some dogs are born with instincts to ward off intruders of many kinds. Fearless dogs are the best candidates for being guard dogs, but they must not be overly aggressive. You must train them correctly to guard, protect, and be good companions for your family.
