1Cane Corso
Aleksey Petrov / EyeEm//Getty ImagesThis strong breed's name roughly translates from Latin as "bodyguard dog." They're smart, trainable, and assertive.
2Doberman Pinscher
JamesBrey//Getty ImagesThese strong dogs require a lot of exercise. Just like their long legs and sleek figure would suggest, they're incredibly fast and powerful.
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3Boxer
ADalton//Getty ImagesThe Boxer has long been one of America's favorite breeds. They're loved for their playful attitudes and watchdog intuition.
4German Shepard
Purple Collar Pet Photography//Getty ImagesGerman Shepards are used as police dogs for a reason. Not only are they whip-smart, but they're defensive of their loved ones.
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5Belgian Laekenois
BSIPThis loyal working dog breed is identifiable by their rough, tousled coat. They're know for being protective of their people and property.
6Australian Shepard
Jeff Greenough//Getty ImagesThis beautiful breed isn't all looks! They make great guard dogs thanks to their incredible trainability and their tough work dog bloodline.
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7Rottweiler
Miroslav Prouza / EyeEm//Getty ImagesRottweilers are known to be a bit aggressive with people they don't know. That standoffish attitude is sure to keep strangers away, if their strong stature isn't intimidating enough!
8Estrela Mountain Dog
slowmotiongli//Getty ImagesThis Portuguese dog was bred to protect livestock, making them natural guard dogs. They're definitely not for small spaces, though: these fluffy dogs can weigh up to 132 pounds!
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9Caucasian Shepherd Dog
American Kennel Club This is a fierce guard dog breed that is probably not for first-time dog owners. That fierceness comes from their history: Caucasian Shepherds were used for centuries to protect properties from trespassers and to guard livestock from predators such as wolves and coyotes.
10Staffordshire Bull Terrier
Gustav Stening//Getty ImagesDon't judge this breed by its small size. Staffordshire Bull Terriers are descended from the fighters in England's dog fighting pits, and they still have that fighting spirit!
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11Tibetan Mastiff
Laures//Getty ImagesThis ancient dog is called the "guardian dog supreme" by the AKC. They're known for being quiet and gentle around the house, despite their massive size.
12Thai Ridgeback
DevidDO//Getty ImagesThai Ridgebacks are a great medium-sized guard dog, if you want something on the smaller side. They're highly intelligent and a loyal family pet.
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13Beauceron
Auscape//Getty ImagesWell trained Beaucerons make great watchdogs, but they're not for first-time dog owners. The AKC says this breed is so cunning, it can end up owning you!
14Catahoula Leopard Dog
American Kennel Club This spotted breed was originally bred in Louisiana. They're independent, territorial, and protective.
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15Giant Schnauzer
cynoclub//Getty ImagesJust like a regular Schnauzer, only bigger! Much like their smaller companions, Giant Schnauzers are loved for their intelligence and loyalty.
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