38 Dog Breeds That Require Extra Caution and Understanding

16. Saint Bernard

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Saint Bernards rank among the world's most beloved breeds. Native to the Swiss Alps, these enormous dogs are famous for mountain rescue missions in freezing temperatures. Females weigh 120–140 pounds, males 140–180 pounds, and might not realize their own strength. Though usually gentle and intelligent, they can become aggressive without socialization. What children find amusing can quickly turn dangerous, so training becomes necessary for this and many other breeds.