A rampant virus infecting dogs in Chicago has spread to Wisconsin.
More than a dozen cases of the so-called dog flu have been confirmed in the state, and no one knows where it originated.
The National Canine Influenza Taskforce has alerted veterinarians that the disease has spread from Chicago to Racine, Milwaukee, and Green Bay.
About 8 in 10 dogs exposed will get infected.
Veterinarians say it can be hard to notice the symptoms.
"Unfortunately the symptoms are not very specific for influenza, in general what we call kennel cough," veterinarian Libby Gutting.
Places where dogs can get nose-to-nose with other dogs, like kennels and dog parks, increase the likelihood of transmission.
The most vulnerable are new born and elderly dogs.
There is a vaccine for two strains of the dog flu.