Shar-pei. Despite his smaller size, the shar-pei can be a good guard dog. With a somewhat aloof temperament, this breed is better suited to families with older children but will protect every member of this family to the best of his ability.

Chow chow. The chow is one of the most easily recognized breeds. Popular because of his thick fluffy coat, the chow is a great guard dog. His teddy bear looks are quite deceiving. This dog can launch an impressive attack if provoked.

Doberman pinscher. The regal looking Dobie hails from Germany. A natural protector, the Doberman excels in guarding and police work.

Giant schnauzer. Unlike his smaller relatives, the giant schnauzer is a member of the working group. Historically used to drive cattle and guard livestock, the giant schnauzer today can be found as a police dog, guard dog and faithful companion.

Dogue de Bordeaux. Made popular in the movie "Turner and Hooch", the Dogue de Bordeaux is a formidable opponent for any stranger. Very protective, you needn't worry about your property if your dog is on guard.

Anatolian shepherd. Recently accepted by the AKC, the Anatolian shepherd has an intense devotion and loyalty to his family and flock. Considered one of the best guard dogs around, this dog is slowly gaining popularity in the US.

Kuvasz. Similar to the Great Pyrenees, the kuvasz is a large white dog used to herd and protect sheep. Originally from Tibet, this breed is a natural guardian and actually prefers outdoor life, patrolling his territory.

Mastiff. This giant imposing dog can be rather intimidating. Previously used in dogfights and as a draft dog, the mastiff is a devoted and faithful family pet, willing to do whatever it takes to keep his family safe.

Presa Canario. The presa Canario is a member of the mastiff family hailing from the Canary Islands. An excellent and natural guard dog, this breed needs a strong hand and is considered one of the more aggressive dog breeds.

Fila Brasileiro. Also known as the Brazilian mastiff, the fila Brasileiro is known as a fierce guard dog. Although a rare breed, his striped hair coat and natural protective instincts have led to the breed slowly gaining popularity.

Great Pyrenees. A true shepherd dog, the Great Pyrenees has accompanied many sheep herders and was an invaluable asset when the sheep needed protection and direction. A great guard dog, the Pyrenees will keep his home and family safe.

German shepherd. Nearly always topping the most popular breed lists, the German shepherd has natural guarding and protecting instincts. Used throughout the world as a police dog and guardian, this breed has proven his natural protective instincts over and over.

Dogo Argentino. Often mistaken as a white pit bull, the dogo is a dog developed by two brothers in Argentina. Also known as the Argentine mastiff, this dog has a large, powerful head and is very protective and loyal.

Rhodesian ridgeback. The Rhodesian ridgeback is only one of two dogs with a naturally occurring ridge down his back. Developed in Africa, the ridgeback was used to hunt lion by taunting and harassing, giving the hunter a chance to approach and kill the lion. A strong minded dog, the ridgeback readily stands his ground and protects his family and territory.

Rottweiler. Despite his current reputation, the Rottweiler was originally developed as a herding dog. His size and strength quickly led him to a more productive life as a protector and guardian.