Allium schoenoprasum
Why is it risky?
Chives contain N-propyl disulfide and other organosulfur compounds, the same toxic class found in onion, garlic, and leeks. These compounds cause oxidative damage to feline red blood cells, leading to Heinz body formation and hemolytic anemia. Cats are more sensitive to this toxicity than dogs.
Affected Systems
Digestive · Cardiovascular
Symptoms
Vomiting, diarrhea, lethargy, pale or yellow gums, elevated heart rate, weakness, reduced appetite. Symptoms may be delayed 1–4 days after ingestion.
What To Do
Remove all access to fresh or dried chives immediately. Contact a veterinarian even with small ingestions, especially if repeated. Bloodwork (CBC) may be needed to check for hemolytic anemia.
Notes
Dried and powdered chives (as in seasoning blends) are more concentrated and equally dangerous. Cross-reference with Onion, Garlic, and Leeks.
Sources
→ ASPCA Animal Poison Control | https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/chives
→ International Cat Care | https://icatcare.org