Why are there so many different kinds of dogs?

Trace the evolution of dog breeds, and find out why their characteristics, behaviors, and personalities vary so widely.

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The immense physical variety of dogs makes them among the world’s most diverse species and likely the one with the greatest range in size. A Pomeranian, for example, might weigh 2 kilograms, while a Mastiff could tip the scale to 100. So, why is this? And what does a dog’s breed actually say about them? Kathleen Morrill Pirovich explores the dizzying diversity of dogs.

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