Why Do Racehorses Pee So Much?
HISA Regulatory Update 2026 HISA Lasix Rules: Stakes Races Banned, Claiming Races Still Permitted HISA now bans race-day Lasix (furosemide) in all stakes races and two-year-old events at federally regulated tracks. Horses that previously ran on furosemide in these conditions must compete without it. For permitted claiming and allowance races, standard 250–500 mg doses remain …