| Verdict for dogs | Toxic |
| Severity | 4 / 5 — Serious — call your vet or poison control today. |
| Safe amount | None |
| Category | Vegetable |
| Source | ASPCA Animal Poison Control — Toxic and Non-Toxic Plants database · reviewed 2026-08-07 · confidence: high |
Leeks are an Allium (Allium ampeloprasum). The ASPCA lists them as toxic to dogs — the same N-propyl disulfide that makes onion and garlic dangerous, causing vomiting and red blood cell breakdown.
Call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 straight away. Tell them what your dog ate, roughly how much, and when, and take the packaging with you. Don't wait for symptoms — with several poisons the harm is done before a pet looks ill.
Never induce vomiting and never give any medicine unless a vet tells you to — it can do more damage than the poison. What we will and won't tell you.
Can cats eat leeks? — Toxic for cats.
No — leeks are toxic to dogs. Call your vet or poison control today, even if your dog seems fine. Leeks are an Allium (Allium ampeloprasum). The ASPCA lists them as toxic to dogs — the same N-propyl disulfide that makes onion and garlic dangerous, causing vomiting and red blood cell breakdown.
Watch for: Vomiting, drooling or diarrhea; Weakness, tiredness or collapse; Pale or yellow gums; Red or brown urine; Fast breathing and a fast heart rate — signs can take 1–5 days to appear. Some signs lag by a day — call, don't wait.
More than a taste can cause real illness, and the risk rises with the amount and with a smaller pet. The safe amount is none — if your dog has had more, call your vet.