Allium ampeloprasum
Why is it risky?
Leeks belong to the Allium family and contain the same thiosulfate/organosulfur compounds as onion, garlic, and chives, which damage red blood cell membranes in cats and can trigger hemolytic anemia.
Affected Systems
Digestive · Cardiovascular
Symptoms
Vomiting, diarrhea, lethargy, pale gums, rapid breathing, weakness. Onset can be delayed several days.
What To Do
Remove access immediately, contact a vet promptly, bloodwork to check red blood cell integrity is often recommended, particularly with larger or repeated ingestions.
Notes
Includes leek greens, whites, and any cooked leftovers containing leek (e.g. soups). Cross-reference with Onion, Garlic, and Chives.
Sources
→ ASPCA Animal Poison Control | https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/leek
→ International Cat Care | https://icatcare.org