Facilities
The breeding facilities that supply beagles for laboratory research — where they are, what happens inside, and what's changing.
3
major US breeders
down from 4+
~31,000
dogs at peak (combined)
Marshall + Envigo + Ridglan
1
remaining after July 2026
Marshall alone
Why This Matters
The US purpose-bred beagle supply chain is collapsing into a single provider. Envigo was shut down by the federal government in 2022. Ridglan is surrendering its license in July 2026. Marshall BioResources — with 20+ USDA violations of its own — will be the last major breeder standing.
Marshall BioResources
Active — Near MonopolyNorth Rose, New York (+ global)
~23,000 dogs · 7 countries · 20+ USDA violations · Founded 1939
The world's largest beagle breeder. With Envigo and Ridglan gone, approaching monopoly status in the US market.
Envigo / Inotiv
Closed 2023Cumberland, Virginia
~5,000 dogs at peak · 70+ AWA violations · $35M fine · 4,000 rescued
Largest AWA enforcement action in history. 60+ years of operation under four corporate owners, ending in federal shutdown and the largest animal rescue in US history.
Ridglan Farms
Closing July 2026Blue Mounds, Wisconsin
~3,200 dogs · 311 DATCP violations · Devocalization without anesthesia
Subject of the 2017 DxE undercover investigation. Surrendering USDA license in July 2026 settlement.
Supply Chain Consolidation
| Facility | Dogs at Peak | Status | What Happened |
|---|---|---|---|
| Marshall BioResources | ~23,000 | Active | 20+ violations, no enforcement. Approaching monopoly. |
| Envigo (Inotiv) | ~5,000 | Closed 2022 | Federal shutdown, $35M fine, 4,000 beagles rescued. |
| Ridglan Farms | ~3,200 | Closing Jul 2026 | 311 state violations, license surrender in settlement. |
| Covance/Labcorp Madison | ~3,953 (2013) | Reduced | Restructured breeding operations. |