My dog ate fish cooked with onions. Should I worry about toxicity?

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.

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.

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.

Hi there and thank you for using Pet Coach! The amount of onion and the size of Paddy should not cause any clinical symptoms associated with toxicity. You may see GI signs such as vomiting / diarrhea. I would monitor for now and if you notice any signs such as lethargy, inappetance, vomiting blood, etc., I would have a veterinarian examine Paddy and test her blood. I hope this helps! Please let me know if you have any other questions / concerns. I am also available via consultation if needed.

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.

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.

You are correct in that onions (and garlic) are toxic to dogs. The good news for Glock is that the degree of toxicity is related to his weight and the amount of onion he consumed. Average onions weigh anywhere between 70-150 grams and can pose toxicity concerns if 15 grams of onion per kilogram of body weight are consumed. Glock would need to ingest around 545 grams of onion to cause the red blood cell concerns associated with onion toxicity. Long story short, you don’t need to do anything or worry!