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I am sorry to hear you are worried about Brandi. My name is Rebecca. I am a veterinarian and will do my best to help.
Onions can be toxic, but cooked onions are less toxic than raw onions. How many would you say she ate? How long ago?
How much does she weigh? Taking a guess of 22 pounds, she would get sick if she ate 150 to 300 grams of onion (that is the onion, not the breading and fat,etc.) That would be 5 to 10 ounces of onion if she weighs around 22 pounds.
I can go weigh an onion ring and see what it weighs; one moment!
I don't have an onion to weigh!
We could try to get her to vomit, since I can't determine how many ounces of onion she ate. I am trying to do the math, but it takes time! If you want to be safe, and to get her to vomit, give her a teaspoon of peroxide in some milk, and if she vomits the onions back up, she will be OK.
The signs of onion toxicity are anemia and weakness, but you may not see that for a day or so.
Still searching to find out if this is enough onion to worry about, so I am still here and researching.
if she does not vomit the onions, it looks like giving her Vitamin C for the next few days will help prevent the toxic symptoms.
200 mg of Vitamin C daily for a week or so will help prevent the toxic principle in onions from destroying her red blood cells.
It may take 5 to 10 minutes, and does not always work.
More research: you should give the vitamin C 2 to 3 times a day.
From the vitamin C? It could be.
More searching: I found a case of a 25 pound dog eating a large order of Burger King onion rings. It was just under the toxic dose.
And what I said initially is wrong: cooked onion are more toxic than raw.
If she does not vomit with peroxide, an emergency vet can induce vomiting with stronger medications and also give activated charcoal to absorb any onion in the intestines.
You could also call ASPCA poison control; they would be able to calculate the amount of onion she actually ate (They have a huge data base) but they charge for the call. (###) ###-####/p>
They would know if she ate enough to get onion toxicity.
The more I read, the more I am concerned that she ate enough onions to be worried about. If the peroxide does not get her to vomit, that would probably be best.
Let me know what else I can help with and what happens at emergency. I am still researching.
Let me know if that works; I am still here.
Some dogs are just tough.
How soon do you leave for your vacation? You could start the vitamin C, and have her blood counts checked in 24 to 48 hours.
Good luck; let me know how it goes.
She must be immune to peroxide, or perhaps your peroxide was old. Glad she vomited finally. Were there onion rings in the vomit?
I read about the vitamin C on Veterinary Information Network, recommended by the toxiclogists there.
Let me know if I can help with anything else. If I was helpful, consider rating me so the website knows I helped. Please do let me know how she is doing. Hope you both have a quiet night.
If peroxide is not fresh and fizzy, it won't induce vomiting. Or, some dogs just do not vomit with peroxide.
How is she today? I hope you get to go on and enjoy your vacation.
Kindly consider rating my answer (always appreciated!); you can still get back to me with questions and updates after rating. Rebecca
Great! An appetite is always a sign she feels good. Let me know if I can help with anything else.
The only way the website knows I helped you is if you rate my answer, so I hope I was helpful. Rebecca
How were her blood tests at your vet?