15 Most Aggressive Dog Breeds

Close up of Pit Bull
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While most dog breeds are known for their loving nature, some have earned a reputation for being more aggressive. If you’re looking for a new furry family member and lean towards a gentler or more easily manageable companion, here’s a super exciting list for you – the most aggressive dog breeds to be aware of when making your choice!


white and brown chihuahua puppy
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Meet the pint-sized Chihuahua! While these little pups might not always ace their temperament tests, there’s a bit of debate on whether it’s due to their genes or just needing more training and socializing. Their tiny frames mean even the fiercest Chihuahua won’t cause much harm. But if you’re a Chihuahua owner, giving them the proper training and social skills they need is super important. They deserve a chance to be their best self!


a black and brown dog standing on top of a lush green field
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These dogs might be popular, but they have some traits that need the right kind of handling. While they are super protective and loyal and learn fast, their strong prey drive and powerful build make proper training crucial. With the wrong training, their natural strength and size could pose some risks, so it’s important to make sure they get the right guidance to be the best companions they can be.

tan and black German shepherd near trees during daytime
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These pups are beloved family companions, but did you know they also rank high on our list of most aggressive dogs? With their history in police and military work, they’re no strangers to challenging situations. Sometimes, their protective instincts can lead to aggression if they sense their family is in danger. But fear not! With proper socialization from a young age, you can ensure your German Shepherd grows up to be loyal and happy.

American Bulldog

brown and white american pitbull terrier mix sitting on sidewalk during daytime
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These pups are not your average dogs—they are powerful working animals, not bred to be weak. Standing just under 30 inches tall, they’re like muscle-packed powerhouses weighing over 100 pounds. With their sturdy build, they can be quite a force if they decide to take action. Picture this – a powerful bite and the ability to jump so high and hard that they can knock an adult flat on their back.

Pit Bull

pit bull, grass, dog
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Pitbull terriers are a pretty hot topic in the U.S. Some folks believe they’re all aggressive, but that’s not true. Many groups are trying to change that idea. Pitbulls have a strong bite and a muscular build because some people use them for dog fighting. But it’s not their fault—they were bred for it. In the wrong hands, they might be aggressive. So it’s essential to understand them and treat them right!


brown dachshund on green grass during daytime
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Here’s another aggressive dog breed, the cute Dachshund! You might know them as “wiener dogs.” Even though they’re small, they can have a bit of an attitude, just like Chihuahuas. They might not be able to do much damage with their bite, but they can be unfriendly towards strangers. While it’s tempting to spoil your Dachshund and treat them like cuddly lap dogs, it’s very important to train and socialize them.

Chow Chow

photo of adult brown Chow Chow
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This dog looks like a fluffy teddy bear but has a reputation for being aggressive. However, their aggressive behavior is predictable. Chows tend to be wary of strangers and other dogs if they’re not taught to be social from when they’re young. Plus, they’ve got a strong instinct to chase after prey, which can seem like even more aggression. But you can raise a calm and happy Chow Chow!

Doberman Pinscher

a black and brown dog running across a lush green field
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Doberman Pinschers can be awesome pals when well-trained, but they have a reputation for being aggressive. Even if they’re super chill, their size, speed, and strength can be intimidating. Most of the time, when Dobermans act aggressive, it’s because they’re scared. So, it’s important to help them manage their anxiety and teach them to feel confident around new people and places.

Jack Russell Terrier

white and brown puppy petching wood
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We know these dogs might not look aggressive to you, but they’re known for being pretty stubborn and having a strong urge to chase after prey despite being small. They are bursting with energy, so they need plenty of exercise and things to keep their minds busy. They might start biting if they’re not given enough attention or time with others. Though their bites aren’t as serious as bigger doggos, you must still beware!

Siberian Husky

white and brown siberian husky lying on gray wooden floor
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Unlike some other dogs we’ve talked about, Huskies are not usually aggressive because they protect something or feel anxious. Instead, it often comes down to not getting the right training and time with others. Huskies are super strong-willed, which can be a real test for even the best dog owners. Plus, they’ve got a strong instinct to chase after prey, which might seem like they’re just plain aggressive.


dalmatian dog lying on gray textile
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These dogs might look friendly but can show signs of aggression. According to experts, it’s because they were once used as guard dogs, so they’re naturally suspicious of strangers. Even though their fame dipped a bit after the 101 Dalmatians movie, they’re still super recognizable pups. But don’t get one just because you love their spots! Dalmatians need lots of training and time with others to be happy and safe pets.

Neapolitan Mastiff

“Neapolitan mastiff” by gomagoti is licensed under CC BY-SA 2.0

Let’s talk about the Neapolitan Mastiff, the famous Fang from Harry Potter! These dogs are super loyal and protective. They can be a bit aggressive towards strangers or those they see as a threat. Training them well and giving clear commands is key to keeping them in check. Neapolitan Mastiffs are big and strong, so tackling any behavior problems early on is very important to keep things smooth and friendly.

Presa Canario

“Presa-Canario-Dogo-Brindle-Dog-1024×768” by Kamen rider snipe is licensed under CC BY-SA 4.0

Meet the Presa Canario, also known as the Canary Mastiff! These pups are like the guardians of the dog world, being super protective and a bit wary of strangers. Initially bred for guarding and even some fighting, they’ve got the size and strength to match. If you’re up for the challenge and considering one as your sidekick, ensure you are experienced with dogs and know how to teach them to be friendly.

Dogo Argentino

a close up of a dog laying on the ground
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These pups are known to be one of the most aggressive dog breeds. Wrangling their behavior requires firm training and owners who know the ropes. With a keen hunting instinct, it’s wise to keep them distinct from other animals like cats to avoid mishaps. And beware, they pack a powerful bite. So before bringing one of these powerful pals home, make sure you’re super ready for the challenge!


short-coated fawn dog
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These dogs were bred for hunting, so they’re pretty independent and strong-minded. They also have a rep for being really aggressive and chasing after anything they see. If you’ve got other pets, especially small ones like cats, a Basenji might not be the best fit for your home. They do get super close to their owners, but they can be a little bit protective, which leads to unfriendliness with strangers.