Dog Disease Outbreaks in Wisconsin

Altoona

Lake Altoona Beach, 604 S Beach Dr; beach closed and a countywide advisory issued, toxin levels high enough to harm people and animals

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

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

Is there a dog disease outbreak in Wisconsin right now?

ParvoMaps is currently tracking 2 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.