Evidently, some dogs are more sensitive than others to the effects of onions. Many years ago, we had 3 small dogs that my husband often fed scraps (including cooked onions) to. In our defense, even though he had had dogs growing up, we had never heard about dogs and onions. One of the dogs had to be rushed to the vet when she suddenly was so weak she could barely walk; she was so anemic the vet gave her an emergency transfusion (from a Dobie!). We never saw any sign of trouble in the other two; unless Phipps randomly got a lot more of the onions than her sisters, I have to assume that she had more of a reaction than the other two did. My conclusion is that you may be able to give small quantities to some dogs and never see the effects (though I suppose, if you were taking blood samples, you would see that they had readings that were a bit on the low side), but onions, in any form, are far from harmless when it comes to dogs.