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I'm Dr. Barbara, and I'm glad to be of help to you, Tank, and Gray-ce today. The toxic dose of onions is 5g/kg of body weight. 85 pounds is 38.6kg, and 100 pounds is 45.5kg. Tank would have to have eaten 193 grams of onion, and Gray-ce 227.3 grams of onion. 1 gram is 0.0022 pounds so your onions had to have weighed 1/2 pound for Tank to have eaten a toxic dose, and a toxic dose for Gray-ce would have been about 0.6 pounds of onion. I strongly suspect that the onion in 4 onion rings didn't weigh even 1/2 pound, so even if one of your dogs ate them all there would be no systemic toxicity.
It is possible (but not probable) that the onion rings may cause some gastric irritation, and in this case there may be some nausea and decreased appetite.
Hope this helps you all! Let me know if you have any further questions or concerns.
How are Tank and Gray-ce doing???? Do you have any further questions or concerns for me? If not, I'd greatly appreciate your rating our chat as this is the only way I can receive credit.
Thank you so much,