Checked against the SaluPaws toxic-food database
The whole allium family — onions, garlic, leeks, chives and shallots — is toxic to dogs, raw or cooked, fresh or powdered. Their compounds destroy red blood cells and cause haemolytic anaemia, and symptoms are often delayed by 1–5 days. A dog that seems fine today is not in the clear.
Toxic effects are generally seen from around 0.5% of body weight in onions — roughly 50 g (a third of a medium onion) for a 10 kg dog. Two important twists:
Stomach upset may show first, but the serious signs — the anaemia — are usually delayed 1–5 days:
Call your vet or an animal poison line (UK: Animal PoisonLine · US: ASPCA Animal Poison Control) with your dog's weight, what was eaten (fresh, cooked, or powder in a dish), roughly how much, and when — even if your dog seems completely fine. Because signs are delayed, early advice and monitoring beat waiting for symptoms.
SaluPaws checks every food you log against its toxic-food database — the allium family included. Log "garlic bread" or "onion bhaji" and it warns you on the spot, with vet guidance and a timestamped record for your vet. The check works offline, for every user, free.
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A tiny one-off piece is unlikely to harm a medium or large dog, but "small" is relative to your dog's size and the form (powder is far stronger than fresh). Ring your vet with the specifics — and watch for lethargy, pale gums or dark urine over the next five days.
Garlic is toxic to dogs by the same mechanism as onion, and more potent by weight. Some supplements use tiny doses and claim benefits, but veterinary toxicology bodies list garlic as toxic — there's no established safe-and-beneficial dose worth the risk of cumulative red-cell damage.
Yes — onion and garlic powder are the most concentrated forms, and gravy granules, stock cubes and seasoned leftovers are among the most common hidden sources. Check ingredients before sharing any cooked human food.
They're the same plant family with the same toxic compounds. Treat chives, leeks, shallots and spring onions exactly like onion and garlic.
Sources: VCA Animal Hospitals — allium poisoning · MSD Veterinary Manual. This page is general guidance, not a substitute for professional veterinary advice. If your dog has eaten onions, garlic, leeks, chives or shallots, contact your vet.