Dogs Can Be Trained To Detect 90% Covid Cases, Even Asymptomatic: Study Dogs Can Be Trained To Detect 90% Covid Cases, Even Asymptomatic: Study Dogs can be trained to detect more than 90 percent of Covid-19 infections even when patients are asymptomatic, according to research published Monday, which authors hope could help replace the need to quarantine new arrivals. Dogs can be trained to detect Covid-19 infections, a study said. (Representational) Paris, France: Dogs can be trained to detect more than 90 percent of Covid-19 infections even when patients are asymptomatic, according to r...