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Is green onion toxic to a 3 kg Japanese Chin, and does her tiny size make the anemia risk worse than it would be for a larger dog?

Dogs · Food safety

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

Short answer

Green onion is toxic to dogs of every size — there is no safe threshold. However, a 3 kg Japanese Chin is at genuinely higher risk than a large breed because the same amount of onion delivers a much larger dose per kilogram of body weight. The toxin damages red blood cells, and the resulting anemia can take two to four days to become visible, so your dog may seem fine at first. Watch for pale or whitish gums, unusual lethargy, rapid breathing, and a loss of appetite over the next several days. Call your vet if you notice any of these signs, and never feed green onion to a dog of any size.

Green onions (scallions) — Food safety facts

Do not feed · Dogs · 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.

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

Green onions (scallions) 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.

Green onions (scallions) 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 Green onions (scallions) food facts page.

Open the full food page: Green onions (scallions) food facts →

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