Sniffer Dogs Help Mexico Fight the Flesh-Eating Screwworm

With tail wagging, tongue out and ears perked, Hummer - a young mixed breed dog with a slick black coat - sits down in front of a sample of screwworm scent, promptly accepting praise and treats from his handler.

Trained to detect the smell of screwworm, a flesh-eating pest that has infected Mexico's cattle herd and disrupted livestock trade with the United States, Hummer and his canine colleagues offer a glimmer of hope in controlling the worm.

At a government-run training center about an hour outside...

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