German shepherds are intelligent and versatile dogs that were originally bred as herding dogs. However, they are also often used as working dogs in law enforcement and the military.
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Chow chows are large, independent dogs that can be standoffish with strangers. They were originally bred as guard dogs,
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Doberman pinschers are also known for their aggressive reputation. They are intelligent and loyal dogs that were originally bred as guard dogs.
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Rottweilers are another breed that is often seen as aggressive. They are large and powerful dogs that were originally bred as guard dogs.
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Pit bulls are often considered to be the most aggressive dog breed due to their history as fighting dogs and their powerful build and strong jaws.
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It is important to note that any dog can be aggressive, regardless of breed. The key is to provide your dog with proper training and socialization from a young age.