First, veterinarians found it in Chicago, now, it’s in central Illinois. Confirmed cases of dog flu are popping up right in our backyard. Vets are sending out a warning to pet owners to take caution when socializing their dogs. This is a new strain of the influenza, so if you've previously had your dog vaccinated, it will not protect your pet. Vets in central Illinois are encouraging pet owners to have their dogs vaccinated as soon as possible.