Dogs can be endlessly loving when they’re guided by an experienced owner—but many breeds carry strong territorial or prey-drive instincts that can turn dangerous in untrained hands. If you’re new to canine ownership, here are 21 breeds you’ll want to admire from afar (or only bring home if you’re up for the training challenge).
Doberman
Sleek, vigilant and fiercely loyal, Dobermans excel in police and security work—and their sheer power means a half-trained Doberman can be unpredictable. Only take one on if you’re ready to invest in top-tier obedience training.
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