World Dogs can sniff out ‘distinct odor’ in positive diagnosis of COVID-19, researchers say June 1, 2021USA TODAYComments Off on Dogs can sniff out ‘distinct odor’ in positive diagnosis of COVID-19, researchers say Researchers in the U.K. say specially trained dogs can sniff out a "distinct odor" on people infected with SARS-CoV-2, which causes COVID-19.