Best Guard Dogs Breed :-

1) German Shepherd-   German Shepherd Dogs can stand as high as 26 inches at the shoulder and, when viewed in outline, presents a picture of smooth, graceful curves rather than angles. The natural gait is a free-and-easy trot, but they can turn it up a notch or two and reach great speeds.

There are many reasons why German Shepherds stand in the front rank of canine royalty, but experts say their defining attribute is character: loyalty, courage, confidence, the ability to learn commands for many tasks, and the willingness to put their life on the line in defense of loved ones. German Shepherds will be gentle family pets and steadfast guardians, but, the breed standard says, there’s a “certain aloofness that does not lend itself to immediate and indiscriminate friendships.”

2)Doberman Pinscher- Dobermans are compactly-built dogs—muscular, fast, and powerful—standing between 24 to 28 inches at the shoulder. The body is sleek but substantial, and is covered with a glistening coat of black, blue, red, or fawn, with rust markings. These elegant qualities, combined with a noble, wedge-shaped head and an easy, athletic way of moving have earned Dobermans a reputation as royalty in the canine kingdom. A well-conditioned Doberman on patrol will deter all but the most foolish intruder.The Doberman Pinscher is a dog of contradictions. Although he has a reputation as a sharp and even sinister dog, his devoted fans consider him the most loving and loyal of companions. And no, "loyal" isn't a euphemism for "only likes his owner." It's the real thing, a tremendous bond between dog and human that lies at the heart of the Doberman's enduring popularity. Believe it or not, a good Doberman is a stable, friendly dog -- unless you threaten his family.

3) Rottweiler - A male Rottweiler will stand anywhere from 24 to 27 muscular inches at the shoulder; females run a bit smaller and lighter. The glistening, short black coat with smart rust markings add to the picture of imposing strength. A thickly muscled hindquarters powers the Rottie’s effortless trotting gait.

A well-bred and properly raised Rottie will be calm and confident, courageous but not unduly aggressive. The aloof demeanor these world-class guardians present to outsiders belies the playfulness, and downright silliness, that endear Rotties to their loved ones. (No one told the Rottie he’s not a toy breed, so he is liable to plop onto your lap for a cuddle.

4) Great Dane-  As tall as 32 inches at the shoulder, Danes tower over most other dogs—and when standing on their hind legs, they are taller than most people. These powerful giants are the picture of elegance and balance, with the smooth and easy stride of born noblemen. The coat comes in different colors and patterns, perhaps the best-known being the black-and-white patchwork pattern known as “harlequin.”

Despite their sweet nature, Danes are alert home guardians. Just the sight of these gentle giants is usually enough to make intruders think twice. But those foolish enough to mistake the breed’s friendliness for softness will meet a powerful foe of true courage and spirit. Patient with kids, Danes are people pleasers who make friends easily.

5) Boxer- Loyalty, affection, intelligence, work ethic, and good looks: Boxers are the whole doggy package. Bright and alert, sometimes silly, but always courageous, the Boxer has been among America’s most popular dog breeds for a very long time.

A well-made Boxer in peak condition is an awesome sight. A male can stand as high as 25 inches at the shoulder; females run smaller. Their muscles ripple beneath a short, tight-fitting coat. The dark brown eyes and wrinkled forehead give the face an alert, curious look. The coat can be fawn or brindle, with white markings. Boxers move like the athletes they are named for: smooth and graceful, with a powerful forward thrust.

Boxers are upbeat and playful. Their patience and protective nature have earned them a reputation as a great dog with children. They take the jobs of watchdog and family guardian seriously and will meet threats fearlessly. Boxers do best when exposed to a lot of people and other animals in early puppyhood.

6) Tibetan Mastiff-  Watchful, aloof, imposing, and intimidating: The ancient Tibetan Mastiff is the guardian dog supreme. These densely-coated giants are mellow and calm around the house, sweetly devoted to family, and aloof and territorial with strangers.Coming face to face with this ancient behemoth, an intruder up to no good will likely move on to easier pickings. TMs can stand 26 inches at the shoulder and weigh well over 100 pounds. It’s impossible to discuss this breed without leaning on words like “powerful,” “muscular,” “massive,” and “substantial.” And yet, TMs are quite light-footed and will meet a perceived threat with surprising agility. The broad head, with its high-set, V-shaped ears and expressive brown eyes, projects a noble, sagacious expression.

8) Saint Bernard- The Saint Bernard does not rank very high in AKC registrations, but the genial giant of the Swiss Alps is nonetheless among the world’s most famous and beloved breeds. Saints are famously watchful, patient, and careful with children.

The Saint Bernard’s written standard abounds with phrases like “very powerful,” “extraordinarily muscular,” “imposing,” and “massive.” A male stands a minimum 27.5 inches at the shoulder; females will be smaller and more delicately built. The huge head features a wrinkled brow, a short muzzle, and dark eyes, combining to give Saints the intelligent, friendly expression that was such a welcome sight to stranded Alpine travelers.