--- title: Dog Flu: Virus Spreading in Dogs in Midwest description: Dog flu exists and it's spreading. At least 1,000 dogs in Illinois, Wisconsin, Ohio and Indiana were infected in the last month. canonical: https://time.com/3826300/dog-flu-midwest/ author: Justin Worland article:opinion: false article:content_tier: free article:published_time: 2015-04-17T12:11:44.000Z article:modified_time: 2026-02-22T06:28:24.641Z article:section: Science og:title: Dog Flu: Virus Spreading in Dogs in Midwest og:description: Dog flu exists and it's spreading. At least 1,000 dogs in Illinois, Wisconsin, Ohio and Indiana were infected in the last month. og:url: https://time.com/3826300/dog-flu-midwest/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltde093bcdab65f2d0/6988d9b9bc6cfc69913e2a3c/time-logo.jpg?branch=production og:image:width: 1200 og:image:height: 675 og:image:alt: TIME og:type: article twitter:card: summary_large_image twitter:title: Dog Flu: Virus Spreading in Dogs in Midwest twitter:description: Dog flu exists and it's spreading. At least 1,000 dogs in Illinois, Wisconsin, Ohio and Indiana were infected in the last month. twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltde093bcdab65f2d0/6988d9b9bc6cfc69913e2a3c/time-logo.jpg?branch=production --- # Dog Flu Is Spreading In The Midwest > Sponsored content. Supplied in partnership with TIME. 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Future Proof is free at time.com/newsletters. ### Sources * TIME Newsletters: [time.com/newsletters](/c/time-nl-futureproof-2026q3/newsletters?i=664baee9-678e-4da3-b917-b40108946862&cr=time-nl-futureproof-2026q3-v1)  by [Justin Worland](https://time.com/author/justin-worland/)  ## Justin Worland Senior Correspondent Apr 17, 2015 12:11 PM UTC  by [Justin Worland](https://time.com/author/justin-worland/)  ## Justin Worland Senior Correspondent Apr 17, 2015 12:11 PM UTC Pet owners beware: dog flu exists and it’s spreading. At least 1,000 dogs in Illinois, Wisconsin, Ohio and Indiana were infected in the last month, according to research from the University of Wisconsin and Cornell University. Doctors at the two schools identified the virus as a strain of H3N2, a branch of the disease commonly found in Chinese and South Korean dog populations. The virus is not believed to spread to humans. “It’s believed that the H3N2 strain was introduced here from Asia, but how it happened is not known,” said Keith Poulsen, a University of Wisconsin veterinarian, in a press release. Veterinarians suggest pet owners largely approach dog flu the way they approach human influenza. Dogs should be vaccinated and avoid contact with other dogs in areas with flu outbreaks. 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