The best guard dog breeds for protection

The Tibetan mastiff, bred in the Himalayas to guard people as well as livestock, is one of the best guard dogs around. Aloof, mentally sharp, watchful, and a little bit primitive, according to DiNardo, this massive breed is also strong-willed and very territorial. Be aware that if you keep a Tibetan mastiff in your home, it may not allow anyone else to visit. But you can expect it to be mellow and sweet with family members.

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Source: RD.com