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30 Favorite US Dog Breeds

25. Mastiff

The Mastiff is a brave, noble and good-natured breed of dog and can be found in a variety of 3 distinct colors. Another ‘gentle giant’, this large dog will need early socialization and training to keep it friendly and well behaved with other people and animals. They make excellent companion dogs and are eager to please their owners and excel in obedience and agility classes. With a short coat, these dogs need little grooming.