Allium-Family Foods and Dog/Cat Hemolytic Anemia (Onion, Garlic, Leek, Chive, N-propyl Disulfide, Heinz Body Formation) — pet safety profile
High riskAll Allium-family plants — onions, garlic, leeks, chives, shallots, and scallions — contain organosulfur compounds (primarily N-propyl disulfide and thiosulfinates) that cause oxidative damage to hemoglobin in dog and cat red blood cells, leading to Heinz body formation and hemolytic anemia.
What is this product?
All Allium-family plants — onions, garlic, leeks, chives, shallots, and scallions — contain organosulfur compounds (primarily N-propyl disulfide and thiosulfinates) that cause oxidative damage to hemoglobin in dog and cat red blood cells, leading to Heinz body formation and hemolytic anemia. Dogs show clinical signs at 15-30 g/kg body weight of onion (roughly one medium onion for a 40-lb dog); cats are 2-3x more sensitive due to higher hemoglobin sulfhydryl group susceptibility. Garlic is approximately 5x more potent per weight than onion. Critically, the toxic effect is cumulative over days — repeated small exposures from table scraps, baby food containing onion powder, or garlic supplements can cause progressive anemia without a single dramatic ingestion event. Cooking does not destroy the toxic organosulfides.
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