Dogs can be trained to screen for people with COVID-19 with 96 percent accuracy, according to a new study in the journal Plos One. Researchers from the University of Pennsylvania’s School of Veterinary Medicine trained eight Labrador retrievers and one Belgian Malinois to distinguish urine samples from COVID-positive and COVID-negative patients. But it might be a long time before we see dogs used in airports or at sporting events to screen for COVID. In this study, the dogs struggled with a sample from a patient who had tested negative for COVID but had previously had the infection. But it shouldn’t be a surprise that dogs can be trained to detect the coronavirus. Previous studies have shown that trained dogs can detect some forms of cancer from blood samples.