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My 7 kg senior dog takes a joint supplement that lists 'leek powder' — is this hidden source of allium toxic for him over time?

Dogs · Food safety

Last reviewed: 2026-09-05 · Reference ranges: ASPCA, Pet Poison Helpline & Merck Veterinary Manual

Short answer

Yes, leek powder is toxic and should not be in any product meant for dogs. Even in powdered form, it contains the same compounds that damage red blood cells and cause anemia, especially risky for a senior dog whose organs may already be less efficient. Stop giving this supplement immediately and check the labels of all his treats and foods. Call your vet to discuss a safer alternative for joint support. Watch for subtle signs of anemia over the coming weeks: pale gums, tiring easily on walks, or breathing faster than usual.

Leek & chives — Food safety facts

Do not feed · Dogs · full breakdown on the linked food page

Toxic, same family as onion and garlic. Causes red blood cell damage and anemia.

Dogs and cats carry the same rating (Do not feed), so the notes below hold for either pet.

Leek & chives should not be given to dogs at all. Even a small amount can do harm, so there is no portion small enough to be safe.

Do not induce vomiting and do not give milk or oil to “dilute” it. Note the food and roughly how much was eaten, then call your vet or a pet poison hotline and follow their advice on whether to bring the pet in straight away.

Why these cautions matter

Garlic and onion damage a pet's red blood cells and can bring on anaemia. Signs are often delayed for several days, so looking fine straight afterwards does not rule it out.

Leek & chives has no place in everyday feeding: keep the rest of the day's food unchanged after this and watch the next walk and the stool that comes with it.

The full verdict, portion guidance and serving notes are collected on the Leek & chives food facts page.

Open the full food page: Leek & chives food facts →