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In this episode of Discovery, dogs break into song.

In the 1950s Australian zoologists discovered a strange small canine running wild in the highlands of New Guinea.

They named it the New Guinea Singing Dog because of its unique musical howl. Experts have argued about it ever since.

Could it be a relic of the first dog which bonded with prehistoric humans thousands of years ago? Or is it just an ordinary feral village mongrel?

Andrew Luck-Baker goes in search of the truth about the Singer’s history. And along the way, he hears from owners of pet singers about the canines’ sharp wits - and meets a pack of the dogs in full voice.