Canine circovirus, first reported in 2012, has infected two dogs in Michigan, according to the Diagnostic Center for Population and Animal Health at Michigan State University. Veterinarians in the area say they've treated a number of dogs that died after showing symptoms of the virus, including vomiting, lethargy, and diarrhea.

The virus is not associated with a specific disease process, but it has been shown to cause disease when combined with other viruses or bacteria in other species, including pigs. The university center recommends that veterinarians should look for circovirus in animals only after ruling out more common causes of the same symptoms. Meanwhile, veterinarians are encouraging pet owners to monitor any pet displaying symptoms of the virus closely, and not to hesitate to take them to an urgent care clinic if symptoms develop.