My dog ate a sandwich with onion. Should I worry about onion toxicity?

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.

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!

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.

Good question! Onions in larger quantities are toxic to dogs but Milo should be fine with that amount. Also for your information there is a poison control call line for animals should you have other poisoning questions in the future. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Milo.

Thanks for using Petco Pet Education Center, formerly Petcoach! This is not likely to be an issue at all. This if it had any onion powder was likely a tiny amount and he is a large dog. I would not be concerned about this. Good luck and have a great day!

It is unlikely that there was enough onion present to cause a problem, but eating that much pizza will likely cause some gastroenteritis (inflammation of the stomach and intestines) which could lead to vomiting and diarrhea. He could also develop pancreatitis. If he starts vomiting, having diarrhea, isn't wanting to eat, or seems lethargic, please take him to your vet for treatment. In the meantime, withhold for at least 12 hours, then offer small amounts of. a bland diet such as boiled chicken and white rice for the next couple of days. Onions will cause oxidative damage to the red blood cells which can result in anemia. If the onions are going to be an issue, it will be a few days before you would see this, and generally would present as decreased appetite and lethargy. If those symptoms are noted, get him in to your vet for bloodwork. Again, I doubt there was enough onion present to be a problem. as generally its a relatively large amount that has to be ingested to cause a clinical problem. thanks for asking Petco Pet Education Center, formerly Petcoach!