DOGGING IT Some dogs in southern China carry flu viruses originally transmitted from pigs. The viruses probably spread most easily where animals are crowded, such as shelters, farms and markets.
Lindsay Helms/Shutterstock
DOGGING IT Some dogs in southern China carry flu viruses originally transmitted from pigs. The viruses probably spread most easily where animals are crowded, such as shelters, farms and markets.
Lindsay Helms/Shutterstock