Dogs The Scariest Types of Dogs in the World  

Ranker Science
310 votes 84 voters 10 items

List Rules Vote up the most terrifying breeds of dogs you hope to never encounter in the wild.

Dogs are man's best friend, but even a cute and cuddly little puppy can grow up to be a deadly killing machine! While many people own dogs, there are a large number of people afraid of dogs. This fear goes back thousands of years and likely extends to human interactions with the wolf. We know instinctively that dogs can be dangerous, but we love the little furballs anyway. 

That doesn't mean there aren't breeds of dogs that aren't dangerous to humans. There are quite a few kinds of dogs many people consider to be scary and dangerous due to their aggressive nature. We aren't suggesting all dogs of the breeds listed here are dangerous, but due to documented cases, some individuals within a breed have proven to be dangerous to humans. 

These scariest types of dogs are why many people are afraid of them and in some cases, they should be. Approaching an unfamiliar dog of any breed can be dangerous, as plenty of dogs can attack humans. While most do so only when threatened, some will attack completely unprovoked and, when a powerful dog bites into your neck, it's likely you won't be getting up anytime soon.

Perro de Presa Canario is listed (or ranked) 1 on the list The Scariest Types of Dogs in the World
Photo: localpups/flickr/CC-BY 2.0
1 32 VOTES

Perro de Presa Canario


Size: 70 to 160 lbs.

Origin: The Perro de Presa Canario, often called a Canary Mastiff, was first introduced by anthropologist Dr. Carl Semencic. They were first bred in Spain's Canary Islands.

Distinguishing Features: While they have large floppy ears, many owners crop the ears so they stick up. This gives them a distinctive look, which may not be natural, but is common for the species.

Why You Should Be Scared: Males have been known to grow to very large proportions and while they are normally friendly, they can be quite dangerous if they become violent. This typically only occurs when the dog feels threatened, or more importantly, if they perceive other dogs or strangers to be threatening to their pack/family. Their large size makes them dangerous given their tremendous strength making a bite a dangerous prospect.

Type Of: Dog

20 12
Would you run from this dog?
Fila Brasileiro is listed (or ranked) 2 on the list The Scariest Types of Dogs in the World
Photo: Jacekjarz - Own work, CC BY-SA 3.0/WikiMedia Commons
2 28 VOTES

Fila Brasileiro


Size: 88 to 110 lbs.

Origin: The Fila Brasileiro, more commonly known as the Brazilian Mastiff, was first bred in Brazil as a working dog.

Distinguishing Features: They typically have light brown fur, but can have dark bands of color spread throughout their bodies. They also have long floppy ears and a darkened muzzle.

Why You Should Be Scared: Though generally friendly to people and animals they know, the Brazilian Mastiff can be highly protective of the people and places it calls family and home. Their size and loyalty means a perceived threat can result in a harmful bite or attack. These are definitely dogs you need to "get to know" before you should reach out and try to pet them.

Type Of: Dog

16 12
Would you run from this dog?
see more on Fila Brasileiro
Rottweiler is listed (or ranked) 3 on the list The Scariest Types of Dogs in the World
Photo: via Tumblr
3 39 VOTES

Rottweiler


Size: 77 to 132 lbs.

Origin: Rottweilers were bred by the Roman Empire.

Distinguishing Features: They have black bodies with light brown highlights, usually found on the belly and around the muzzle. Many have light brown eyebrows.

Why You Should Be Scared: Rottweilers are often found near the top of the list of deadly dogs. While most are calm with a nice temperament, these dogs have been trained to be highly aggressive watch dogs. Their herding nature makes them incredibly defensive of their territory and the territory of their pack/family. For a trained individual who is protecting someone or something, they can be quite deadly given their overall strength and bite. They make great pets, but you probably need to lock them up when you have unfamiliar people over for afternoon tea.

Type Of: Dog

Examples: Sampson

Also Ranked

#7 on The Very Best Dog Breeds, Ranked

#39 on The Best Apartment Dogs

21 18
Would you run from this dog?
see more on Rottweiler
Dobermann is listed (or ranked) 4 on the list The Scariest Types of Dogs in the World
Photo: Maja Dumat/Flickr
4 32 VOTES

Dobermann Pinschers


Size: 71 to 88 lbs.

Origin: Dobermann pinschers were developed in 1890 by Karl Friedrich Louis Dobermann, a German tax collector.

Distinguishing Features: Most examples are black with light brown fur around the feet, but some are a lighter brown in color. They are highly intelligent dogs capable of being trained for a variety of uses.

Why You Should Be Scared: Under normal circumstances, Dobermann pinschers are gentle dogs with a lovely disposition. They can be easily trained to work as guard dogs and thanks to their incredible loyalty, they can become dangerously aggressive should the need arise. Their attacks can be fatal due to their overall strength, making them a particularly frightening dog.

Type Of: Dog

Examples: Shadow

Also Ranked

#21 on The Very Best Dog Breeds, Ranked

15 17
Would you run from this dog?
see more on Dobermann