12 dog breeds first-time owners should think twice about

9. Rottweiler

Rottweilers are goofy with family and wary with strangers. This all-around breed excels at herding, agility, obedience and other dog sports, but does require proper socialization and obedience to offset its protective instincts. Like many breeds that are used as property and livestock guardians, poorly trained rotties can become territorial and aggressive towards strangers, which makes them a good choice for a more experienced owner.

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