Why is onion bad for rabbits?
A rabbit’s diet is a pyramid with hay at the base: roughly 80% grass hay, 10–15% leafy greens, and a small daily pellet portion (House Rabbit Society model). Anything outside that pyramid is a treat — and sugar is the enemy of the gut flora that keeps a rabbit alive.
Allium vegetables damage red blood cells in small herbivores, leading to weakness and anemia. HRS names onion and garlic explicitly as foods to never feed.
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Can rabbits eat onion?
No — onions are on the HRS do-not-feed list. All alliums (onion, garlic, leeks, chives) are unsafe.
What happens if a rabbit eats too much onion?
Allium vegetables damage red blood cells in small herbivores, leading to weakness and anemia. HRS names onion and garlic explicitly as foods to never feed.