If your dog has eaten anything seasoned, stop reading and call now. Call your own veterinarian, your nearest 24-hour emergency animal hospital, the ASPCA Animal Poison Control Center at (888) 426-4435, or the Pet Poison Helpline at (855) 764-7661 (both US, 24/7, a fee may apply). Take the packet or the jar with you to the phone if you still have it. Do not make your dog vomit unless a veterinarian or a poison line tells you to, for this dog, right now.
This page is general information from a dog parent who reads veterinary sources, not a veterinarian. It exists so your call to a professional is faster and better informed. It is not a substitute for that call.
The short version
Onion powder is not a weaker version of onion. It is onion with the water taken out, which is why the Merck Veterinary Manual points at the powders rather than at the vegetable. On its page on garlic and onion (Allium spp) toxicosis in animals, retrieved 2026-08-26, Merck states that "toxicosis in these species is most commonly associated with ingesting concentrated forms of Allium, such as dehydrated flakes, powders, or dry onion soup mixes."
Read that again, because it inverts the way most people think about this. The route that most often puts a dog in trouble is not a raw onion left on the counter. It is the dried, powdered, blended form that goes into cooking and never looks like an onion at any point.
That is the whole reason this page exists. A gravy has no onion in it that you can see. A rotisserie chicken rub has no onion in it that you can see. A packet of taco seasoning does not look like a vegetable. And the dog who licks the roasting pan has eaten from the concentrated end of the scale, not the mild end.
If your dog ate visible onion rather than a seasoning, our page on what to do when a dog eats onions covers that situation directly.
Why the concentrated form is the dangerous one
Allium is the plant family: onion, garlic, leek, chive, shallot, scallion, and every cultivar of each. Merck notes that "cats are the most susceptible species, followed by dogs," and that "garlic is 3 to 5 times more toxic than onion." Both matter here, because garlic powder and onion powder sit next to each other in almost every blend.
Drying does not remove the toxic compounds. It removes water. What is left is the same plant material in a much smaller volume, which is why a spoonful of powder is not comparable to a spoonful of chopped onion. Cooking does not fix it either; Merck's page records toxicosis in animals that ate raw, cooked, dehydrated and granulated forms.
We are not going to tell you how much is too much. Merck publishes figures, and this site does not republish them, because a number invites arithmetic and the arithmetic is what makes an owner decide not to call. Your dog's weight, age, breed and health all sit inside that decision, and a poison line has them in front of it while a web page does not.
Where onion and garlic hide on a label
This is the part that actually helps you, and it is worth doing once now rather than in a panic later. Packaged savory food is where the exposure lives, and the front of the pack rarely says onion.
| Where it hides | What the label may say instead |
|---|---|
| Gravy granules, gravy mix, jarred gravy | dried onion, onion powder, onion extract, yeast extract with allium seasoning |
| Stock cubes, bouillon, broth concentrate, stock pots | onion powder, garlic powder, dehydrated vegetables, natural flavoring |
| Dry soup mixes and dip mixes | dehydrated onion, onion flakes, toasted onion |
| Seasoning blends (taco, fajita, chili, curry, jerk, Cajun, poultry rub, steak rub, all-purpose) | onion powder, granulated onion, garlic granules, allium |
| Onion salt and garlic salt | listed as themselves, but shelved with salt rather than with spices |
| Baby food, especially savory jars and pouches | onion powder, garlic powder |
| Pasta sauce, curry sauce, chili, baked beans, stuffing mix | onion, onion powder, garlic puree, "spices" |
| Chips, crisps, crackers and savory snacks | onion powder, garlic powder, "natural flavors" |
Two label habits are worth building.
"Spices" and "natural flavors" are not an all-clear. They are permitted collective terms, and allium is one of the most common things inside them. If the food is savory and the ingredient list is vague, treat it as containing allium until you can establish otherwise.
Onion by another name is still onion. Dehydrated onion, granulated onion, onion extract, toasted onion, scallion, shallot, chive, ramp and leek are all the same family. So is every form of garlic.
The gravy question, answered plainly
"There's no actual onion in gravy, is there?" is the exact sentence that brings people to this page, and the honest answer is that gravy is one of the more concentrated exposures in a normal kitchen.
Gravy is built to carry flavor through a large volume of liquid, and dried allium is one of the cheapest ways to do that. Merck names dry onion soup mixes specifically, and gravy granules are the same category of product. The dog does not have to eat a bowl of it: licking a roasting pan, finishing a plate, or getting the drained fat from a Sunday roast can all deliver it.
The same is true of anything a savory sauce has been reduced into. Reduction removes water, and removing water is exactly what makes the concentrated forms the ones Merck points at.
Your dog looks fine, and that is expected
This is the single most important paragraph on the page.
Merck states that Heinz body formation "begins within 24 hours and peaks in approximately 72 hours," and that "hemolysis typically occurs 3 to 5 days after exposure." The damage runs ahead of the symptoms. A dog can eat seasoning at lunch, be bright and hungry all evening, and become ill later that week.
So "he seems okay" is not information about whether he is okay. It is information about today. If you have already been through the day-one version of this, our page on a dog that ate something toxic but seems fine sets out what the gap means and what to watch for.
Do not wait for a symptom in order to decide whether to call. The call is what happens first.
What to do right now
- Call. Your vet, an emergency hospital, or one of the poison lines above. This is not a wait-and-see situation with allium, whatever the amount looks like.
- Do not induce vomiting on your own. Whether it is appropriate depends on what was eaten, how long ago, and this dog specifically. Our page on whether to make a dog throw up explains why that decision belongs to a professional.
- Keep the packaging. The ingredient list is the single most useful thing you can hand over, and photographing it takes five seconds. If the packet is already gone or you genuinely do not know what was eaten, what to do when a dog ate an unknown substance covers that version.
- Write down the time. Not the approximate time. The clock time you last saw the food intact and the clock time you found the dog with it.
- Take the right things with you if you are told to come in. Our page on what to bring to an emergency vet for poisoning is a short list worth reading in the car.
What this page will not do
It will not tell you an amount that is safe, because there is no amount this page is qualified to call safe for your dog. It will not tell you to watch and wait. It will not help you decide whether a professional is necessary, because on this topic the professional is where the decision starts, not where it ends.
What it can do is change what you look at. The next time you are seasoning something, read the back of the packet once. Knowing which three jars in your own kitchen are the concentrated ones is worth more than any threshold you could memorize.
Sources read for this page, retrieved 2026-08-26: Merck Veterinary Manual, "Garlic and Onion (Allium spp) Toxicosis in Animals," for the concentrated-form route, the raw, cooked, dehydrated and granulated forms, species susceptibility, the relative toxicity of garlic to onion, and the Heinz body and hemolysis timelines. ASPCA Animal Poison Control Center and Pet Poison Helpline contact details as published by each organization.
Deliberately not published: Merck's quantitative toxicity figures. This site does not print thresholds in any unit, because a number a reader can do arithmetic with is a number that talks them out of the phone call.