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Scientists found Covid has a “smell” that a trained dog can sniff out in less than a second. Dogs have a powerful sense of smell; they possess up to 300 million olfactory receptors in their noses, compared to about six million in us. Dogs can detect micro-organisms living inside the blood of patients carrying malaria as those little creatures produce a specific “scent” Scientists in different countries turned sniff dogs' experiments to COVID-19 early in the pandemic.