Green onions (scallions) — Food safety facts
Do not feed · Cats · full breakdown on the linked food page
Toxic, same family as onion and garlic. Damages red blood cells and causes anemia that can appear days later.
Short answer
This is a serious situation. Green onions, like all alliums (onions, garlic), are toxic to cats. They damage red blood cells and can cause anemia, with symptoms like weakness or pale gums sometimes taking days to show. Do not wait for signs to appear; contact your veterinarian or the ASPCA Animal Poison Control Center at 888-426-4435 immediately for guidance.
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