Virbac FounderGuard is a palatable pelletised supplement that helps protect horses and ponies from feed-induced laminitis and founder. It's designed for horses on high-grain or lush pasture diets where the risk is elevated.

FounderGuard works via a low-dose antibiotic (virginiamycin) that modifies hindgut fermentation, reducing the production of lactic acid that triggers laminitis in grain-overloaded horses. It's recommended for horses being prepared for sale on high-energy rations, horses with a history of founder or laminitis, and those with hoof quality issues like seedy toe or white line separation. Available in 1kg and 5kg formats.

Breeders and trainers use FounderGuard as a preventative measure when managing horses on unavoidably rich diets — particularly during sales preparation or when transitioning onto spring pasture.