For the first time, Iditarod Trail Sled Dog Race officials are requiring all dogs in the race to be vaccinated for kennel cough.Symptoms of the bug, a highly infectious upper respiratory infection, include a dry honking cough, gagging and retching. In serious cases, the illness can lead to pneumonia and is similar to whooping cough in humans.Read more here: http://community.adn.com/?q=adn/node/159946
