Dog Disease Outbreaks in Wisconsin

East Troy

Booth Lake, Town of Troy, Walworth County; microcystin confirmed, state investigated 9 illness reports; elevated toxins expected through swim season

Mosinee, Marathon County

Lake Du Bay, advisory re-issued 8/13, spans Marathon and Portage counties

Oshkosh, Winnebago County

Lake Winnebago (South Asylum Bay, Menominee Park)

Green Lake, Green Lake County

Green Lake (Sunset Park & County K Marsh boat launch)

Racine

Bat captured by a resident in Racine County tested positive; possible pet exposure, pets quarantined. County-only, pinned at county seat

Shawano, Shawano County

First rabid bat of 2026 in Shawano County, one person receiving treatment

Mosinee, Marathon County

Big Eau Pleine Reservoir (park beach)

Marinette

Bat submitted after potential human exposure tested positive; exact site not disclosed, pinned at county seat

Is there a dog disease outbreak in Wisconsin right now?

ParvoMaps is currently tracking 4 active reports in Wisconsin, most commonly blue-green algae. Reports stay marked active for a set window per disease, then move to historical.

What dog diseases have been reported in Wisconsin?

Reports in Wisconsin cover blue-green algae, rabies, drawn from news coverage, health department notices and community reports.

How do I know if a report near me is still current?

Every report carries the date it happened and a link to its source. Each disease has its own active window — blue-green algae advisories expire in 30 days, parvo reports stay active for a year — so a pin marked active is one still worth acting on.