My dog ate a tiny bit of cooked onion. Is it toxic or dangerous?

It typically takes ingestion of about 0.5% of your pet's body weight of onion to be at risk of onion related toxicity. This calculates out to be approximately 0.15 lbs, or around 2 ounces. Unless your pet ate anything close to that amount or more, it is not recommended to do decontamination for him. With a piece of [onion](https://www.petcoach.co/canigive/dog/onions) that only weighs a few grams I would not be concerned. Just monitor him for the next couple of days for any GI upset, lethargy, panting or pale gums. And if he gets a hold of any more you can always contact the [Pet Poison Helpline](https://www.petpoisonhelpline.com/). There is a charge associated with this call.

The dose of onion in dogs that is toxic is about 0.5 grams per kilogram of body weight. For a 10 pound dog, that would be about 20 grams of onion. There are about 5 grams in each teaspoon, so Marlin would have to eat over 4 tsp of onions in order to be concerned about toxicity. The biggest concern comes with dehydrated onions which are much more concentrated than fresh onions. It sounds like Marlin will be fine, but please contact your veterinarian if you have any concerns. I hope that was helpful! Thanks for using Petco Pet Education Center, formerly Petcoach.

Hello. If it was just a one time small piece, he will be fine. A dog this size would have to eat a tablespoon or so of cooked onion to even begin to have any issues. He will be fine. Thanks for using Petco Pet Education Center, formerly Petcoach.

Thank you for reaching out to Petco Pet Education Center, formerly Petcoach with your question about GG. The toxic amount of onion in dogs is 100 grams (about the size of a medium onion) per 20kg of a dog's weight to cause toxic effects, which means that a 45 pound dog would have to eat a medium to large onion to experience dangerous toxicity levels. Luckily in this case, two onion rings will not contain that much onion. There is a concern about the fattiness of the onion rings, as they are fried, and fried and fatty foods can cause pancreatitis in dogs. I would monitor her for vomiting, diarrhea, abdominal pain, a hunched up appearance, vomiting undigested food, and lethargy. If you see any of those signs, have her seen by a vet immediately. Hopefully, however, she will be just fine, and I don't think in this case, you need to do anything. Don't induce vomiting, and there's no need to take her into a vet unless you see any of the signs I just mentioned. I hope this helps!

Hello and thank you for contacting Petco Pet Education Center, formerly Petcoach. Onion in toxic to dogs but the toxic dose is fairly high. Sadie would have to eat more than a half of a large onion (or a whole normal size onion) to get into any trouble. She may show mild signs of stomach upset, like a bout of vomit or loose stools but there should not be any more concerning symptoms.

Hello and thank you for contacting Petco Pet Education Center, formerly Petcoach. Onion in toxic to dogs but it does not sound that Dakota has eaten large enough amount of onions to develop intoxication. The toxic dose of onion is about 15-20g/kg of bodyweight, so it means that Dakota would have to eat about 300-400 grams of onion (which is a whole large onion) to get into trouble. Please, keep an eye on her at home, she may develop mild signs of gastroenteritis (one vomit, mild diarrhea etc) but there should not be any other worrying symptoms.

A few pieces of onion ingested by a dog of Mochi's size will likely cause nothing worse than some minor stomach upset, if anything at all. She would need to eat 2 or 3 med/large onions in order to be at risk of serious toxicity. If she develops vomiting or diarrhea but continues to behave normally, you can fast her for 24 hours then feed a bland diet in small, frequent amounts until symptoms resolve. Transition slowly to her regular diet afterwards.