20 Rare Dog Breeds You Have Probably Never Heard Of

5. New Guinea Singing Dog

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The New Guinea Singing Dog is famous for vocalizations that sound like yodels and form a chorus when several sing together. These wild dogs from New Guinea are among the rarest, with very few left in the wild. Their song is unlike any other breed, with harmonic notes like a blend of whale song and wolf howl. Scientists think these dogs changed little for thousands of years, making them a living link to ancient canines. Their fox like look, flexible spine, and upright ears aid survival. Though some are kept in captivity for conservation, they are not good household pets due to strong wild instincts.