AGGRESSIVE

1.Pitbull  

Origin: US; Weight: 30-55 lbs; Height: 18-22 inches
Nobody can deny that it has aggressive instincts. As long as they can be raised as family dogs. They can kill small animals like cats in seconds, they can even attack other pitbulls.

2.Rottweiler

Dog Breed
The Rottweiler is a medium to large size breed of domestic dog. The dogs were known as "Rottweil butchers' dogs" because they were used to herd livestock and pull carts laden with butchered meat and other products to market. Wikipedia
Life span: 9 to 10 years
Origin: Germany
Temperament: Devoted, Good-natured, Alert, Steady, Self-assured, Obedient, Calm, Confident, Courageous, Fearless
Mass: 50 – 60 kg (Fédération Cynologique Internationale breed standard, Adult, Male), More
Height: 61 – 69 cm (Fédération Cynologique Internationale breed standard, At the withers, Male, ...), More
Colors: Mahogany, Tan, Black

3.German Shepherd Dog

Dog Breed

The German Shepherd, is a breed of large-sized dog that originated in Germany. German Shepherds are a relatively new breed of dog, with their origin dating to 1899. Wikipedia
Lifespan: 9 – 13 y
Origin: Germany
Temperament: Watchful, Alert, Curious, Obedient, Loyal, Confident, Courageous, Intelligent
Colors: Grey, Sable, Black & Tan, Blue, Red & Black, Black & Silver, Liver, Black, White
Mass: 30 – 40 kg (Male, Adult), 22 – 32 kg (Female, Adult)
Height: 60 – 65 cm (Adult, At Shoulder, Male), 55 – 60 cm (Adult, Female, At Shoulder)

4.Boxer

Dog Breed

The Boxer is a breed of stocky, medium-sized, short-haired dogs developed in Germany. Their coat is smooth and tight-fitting; colors are fawn or brindled, with or without white markings, which may cover the entire body. Wikipedia
Life span: 10 to 12 years
Origin: Germany
Temperament: Playful, Devoted, Bright, Loyal, Energetic, Friendly, Calm, Cheerful, Confident, Fearless, Brave, Intelligent
Colors: Fawn, Brindle, White
Mass: 25 – 27 kg (Female, Adult), 30 – 32 kg (Male, Adult)
Height: 57 – 63 cm (Male, Adult), 53 – 60 cm (Female, Adult)

5.Siberian Husky

Dog Breed

The Siberian Husky is a generally large-size, dense-coat working dog breed that originated in north-eastern Siberia. The breed belongs to the Spitz genetic family. Wikipedia
Lifespan: 12 – 15 y
Origin: Russia
Temperament: Outgoing, Alert, Gentle, Friendly, Intelligent
Colors: Agouti, Red, Grey, Splash, Sable, Black & Tan, Copper, Brown, Black & White, Piebald, Silver, Black, White
Height: 53 – 60 cm (Male, Adult), 51 – 56 cm (Adult, Female)
Mass: 16 – 23 kg (Female, Adult), 20 – 27 kg (Male, Adult)

6.Alaskan Malamute

Dog Breed

The Alaskan Malamute is a generally large breed of domestic dog originally bred for use hauling heavy freight because of their strength and endurance, and later an Alaskan sled dog. Wikipedia
Hypoallergenic: No
Life span: 13 to 16 years
Temperament: Playful, Devoted, Loyal, Friendly, Dignified, Affectionate
Height: 63.5 cm (Male, Adult), 58.4 cm (Female, Adult)
Colors: Brown & White, Gray & White, Sable & White, Seal & White, Red & White, Black & White
Weight: Female: 32–38 kg, Male: 36–43 kg

7.Dobermann

Dog Breed

The Doberman Pinscher or simply Doberman, is a breed of domestic dog originally developed around 1890 by Karl Friedrich Louis Dobermann, a tax collector. Wikipedia
Lifespan: 10 – 13 y
Origin: Germany
Temperament: Alert, Obedient, Loyal, Energetic, Fearless, Intelligent
Colors: Red, Fawn, Blue, Black, White
Height: 69.8 cm (Male, Adult), 64.8 cm (Female, Adult)
Mass: 34 – 41 kg (Male, Adult), 27 – 36 kg (Female, Adult

8.Chow Chow

Dog Breed

The Chow Chow is a type of dog breed originally from China, where it is referred to as Songshi Quan, which means "puffy-lion dog". Wikipedia
Lifespan: 9 – 15 y
Height: 43 – 51 cm (Adult)
Origin: China
Temperament: Aloof, Loyal, Quiet, Independent
Colors: Red, Fawn, Cream, Black
Mass: 25 – 32 kg (Male, Adult), 20 – 27 kg (Female, Adult)

9.Perro de Presa Canario

Dog Breed

The Perro de Presa Canario is a large Molosser-type dog breed originally bred for working livestock. The name of the breed is Spanish, means "Canarian catch dog", and is often shortened to "Presa Canario" or simply "Presa". Wikipedia
Origin: Spain
Life span: 9 to 11 years
Temperament: Strong Willed, Gentle, Calm, Suspicious, Dominant
Height: 58 – 66 cm (Adult, Male, At the withers, ...), 56 – 64 cm (Female, Adult, At the withers, ...)
Mass: 45 – 64 kg (Adult, Male, Breed standard), 39 – 54 kg (Female, Adult, Breed standard)
Colors: Red Fawn, Fawn, Brindle, Red Brindle, Black, Silver Fawn

10.Dalmatian

Dog Breed

The Dalmatian is a breed of dog whose roots trace back to Croatia, where the first illustrations of the dog have been found. The Dalmatian is noted for its unique black or liver spotted coat and was mainly used as a carriage dog in its early days. Wikipedia
Life span: 10 to 13 years
Temperament: Outgoing, Playful, Energetic, Friendly, Active, Intelligent, Sensitive
Origin: Greece, Croatia
Height: 53 – 66 cm (Adult, Male), 46 – 64 cm (Female, Adult)
Mass: 15 – 32 kg (Male, Adult), 16 – 24 kg (Adult, Female)
Colors: Liver & White, Black & White