An instructor poses with his sniffer dog during an experimental training to detect Covid-19 through sweat, at the Campus Bio-medico University Hospital in Rome on March 31, 2021. AFP

A sniffer dog takes part in an experimental training to detect Covid-19 through sweat, at the Campus Bio-medico University Hospital in Rome on March 31, 2021. AFP

A dog is seen during its training to detect the coronavirus disease (COVID-19) in Songkhla, Thailand March 3, 2021. REUTERS

DOGS

A sniffer dog takes part in an experimental training to detect Covid-19 through sweat, at the Campus Bio-medico University Hospital in Rome on March 31, 2021. AFP

A sniffer dog takes part in an experimental training to detect Covid-19 through sweat, at the Campus Bio-medico University Hospital in Rome on March 31, 2021. AFP