The statement that dogs are man’s best friend has been proven as a statement of fact, however, some dogs can be very aggressive, not only to strangers, but also to those who own them read below world most aggressive dog.

As friendly as dogs can be, there are those who have great killer instincts and must be handled with care. Below are those dogs which the term aggressive would not even do justice to their killer instincts.

1 Cocker Spaniel

This breed were originally used as gun dogs because of their strong sense of smell. Know to be useful in the tracking of birds for hunting; the Cocker Spaniels have recorded about 60 fatalities.

The English Cocker Spaniel is an active, good-natured, sporting dog, standing well up at the withers and compactly built. Outside the US, the breed is usually known simply as the Cocker Spaniel, as is the American Cocker Spaniel within the US. The word cocker is commonly held to stem from their use to hunt woodcock.

2 Alaskan Malamute

The Alaskan Malamute is a large breed of domestic dog originally bred for hauling heavy freight because of their strength and endurance, and later a sled dog. They are similar to other arctic breeds, such as the Greenland dog, Canadian Eskimo Dog, the Siberian.

Alaskan Malamutes are still in use as sled dogs for personal travel, hauling freight, or helping move light objects; some, however, are used for the recreational pursuit of sledding, also known as mushing, as well as for skijoring, bikejoring, carting, and canicross.

However, most Malamutes today are kept as family pets or as show or performance dogs in weight pulling, dog agility, or packing.

Malamutes are generally slower in long-distance dogsled racing against smaller and faster breeds, so their working usefulness is limited to freighting or traveling over long distances at a far slower rate than that required for racing.

The Alaskan Malamute is “the largest and most powerful” sled dog, and was used for heavier loads.

3 Husky

Husky is a general name for a sled-type of dog used in northern regions, differentiated from other sled-dog types by their fast pulling style
They are an ever-changing cross-breed of the fastest dogs.

Huskies are also today kept as pets, and groups work to find new pet homes for retired racing and adventure trekking dogs.

Huskies are energetic and athletic. They usually have a thick double coat that can be gray, black, copper red, or white.

Their eyes are typically pale blue, although they may also be brown, green, blue, yellow, or heterochromic. Huskies are more prone to some degree of uveitis than most other breeds.

Huskies hold a record of 15 fatalities and after their work life, they are sent to households as pets in their old age. This breed suffers from heterochromia, which means that different dogs have different colored eyes.

Huskies are used in sled dog racing. In recent years, companies have been marketing tourist treks with dog sledges for adventure travelers in snow regions as well.

4 Wolf Dog Hybrid

A wolfdog (also called a wolf–dog hybrid or wolf hybrid) is a hybrid resulting from the hybr idization of a domestic dog to one of four other dog sub-species, the gray, eastern timber, red, and Ethiopian wolves.

A wolf’s behavior is typically more socially shy and timid toward humans than that of a dog

Due to the variability inherent to their hybridization, whether a wolf–dog cross should be considered more dangerous than a dog depends on behavior specific to the individual alone rather than to wolfdogs as a group.

5 Doberman Pinscher

Doberman Pinschers are well known as intelligent, alert, and tenaciously loyal companions and guard dogs. Personality varies a great deal between each individual, but if taken care of and trained properly they tend to be loving and devoted companions.

The Doberman is driven, strong, and sometimes stubborn. The Doberman stands on its toes (not the pads) and is not usually heavy-footed.

Ideally, they have an even and graceful gait. Traditionally, the ears are cropped and posted, and the tail is docked. However, in some countries it is illegal to do so. Dobermans have markings on the chest, paws/legs, muzzle, above the eyes, and underneath the tail.

The Doberman Pinscher ranked relatively high on stranger-directed aggression, but extremely low on owner-directed aggression. They are ranked as average on dog-directed aggression and dog rivalry. Looking only at bites and attempted bites, Doberman Pinschers rank as far less aggressive towards humans, and show less aggression than many breeds without a reputation.

6 Bull Mastiff

The Bullmastiff is a large-sized breed of domestic dog, with a solid build and a short muzzle. It shares the characteristics of molosser dogs, and was originally developed by 19th-century gamekeepers to guard estates.

The breed’s bloodlines are drawn from the English Mastiff and the extinct Old English Bulldog.

It was recognized as a purebred dog by the English Kennel Club in 1924.

They are quiet dogs and very rarely bark.

Dogs of this breed are natural guardians of their home and owners. No special guard training is needed for a Bullmastiff to react appropriately if its family is endangered.

During training, a Bullmastiff requires a special approach, because these dogs do not like to repeat the same actions again and again.

7 Tosa Inu

The Tosa or Japanese Mastiff is a breed of dog of Japanese origin that is considered rare.

It was originally bred in Tosa (present day Kōchi) as a fighting dog and still is today.

The Tosa varies considerably in size, with the Japanese-bred dogs tending to be about half the size of those bred outside the country.

he Japanese breed generally weighs between 36 and 61 kilograms (80 and 135 lb), while the non-Japanese breeders have focused on dogs that weigh from 60 to 90 kg (130 to 200 lb) and stand 62 to 82 cm (24 to 32 in) at the withers.

The coat is characterized by its short and smooth appearance and is often red, brindle, or fawn. Occasionally it can be a dull black, but this is somewhat rare. Maintenance of the coat is usually minimal.

Ownership of Tosas is legally restricted in certain jurisdictions. In the United Kingdom and Republic of Ireland ownership is regulated under the Dangerous Dogs Act 1991, and in Trinidad & Tobago under the Dangerous Dogs Act 2000.

Some insurance companies will not insure homes with dog breeds deemed dangerous

The Tosa is one of eleven breeds of dog banned in 2007 by the Dublin City Council from their properties, including council houses, flats and estates.

8 German Shepherd

The German Shepherd is a breed of medium to large-sized working dog that originated in Germany.

The breed’s officially recognized name is German Shepherd Dog in the English language (sometimes abbreviated as GSD).

The breed is also known as the Alsatian in Britain and Ireland. The German Shepherd is a relatively new breed of dog, with their origin dating to 1899.

As part of the Herding Group, German Shepherds are working dogs developed originally for herding sheep. Since that time however, because of their strength, intelligence, trainability, and obedience, German Shepherds around the world are often the preferred breed for many types of work, including disability assistance, search-and-rescue, police and military roles, and even acting.

9 Rottweiler

The Rottweiler is a breed of domestic dog, regarded as medium-to-large or large.

They were known in German as Rottweiler Metzgerhund, meaning Rottweil butchers’ dogs, because one of their uses was to herd livestock and pull carts laden with butchered meat to market.

This continued until the mid-19th century when railways caused droving to be replaced with herding.

Rottweilers are now used as search and rescue dogs, as guide dogs for the blind, as guard dogs and police dogs.

10 Pit Bull

Pit bull is the common name for a type of dog often considered in North America to be of the pit bull family, they include American Pit Bull Terrier, American Staffordshire Terrier, American Bully, and Staffordshire Bull Terrier. The American Bulldog is also sometimes included.

Many of these breeds were originally developed as fighting dogs from cross breeding bull-baiting dogs (used to hold the faces and heads of larger animals such as bulls) and terriers.

After the use of dogs in blood sports was banned, such dogs were used as catch dogs in the United States for semi-wild cattle and hogs, to hunt and drive livestock, and as family companions.

Contrary to popular myth, pit bulls do not have “locking jaws”. There is no physiological “locking mechanism” in the jaw muscle and bone structure of pit bulls or other dogs.

Pit bull-type dogs, like other terriers, hunting and bull-baiting breeds, can exhibit a bite, hold, and shake behavior and at times refuse to release.

Pit bulls also have wide skulls, well-developed facial muscles, and strong jaws, and some research suggests that pit bull bites are particularly serious because they tend to bite deeply and grind their molars into tissue.

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