An illustration photo shows Ziggie the Dog wearing a mask put on her face by her owner in Los Angeles, on April 5, 2020. After a tiger in the Bronx zoo tested positive for Covid-19, the zoo emphasized that there is "no evidence that animals play a role in the transmission of COVID-19 to people other than the initial event in the Wuhan market, and no evidence that any person has been infected with COVID-19 in the US by animals, including by pet dogs or cats."