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There are many kinds of food that humans eat which are unsafe for dogs.

Onions are not an exception.

Feeding your pooch onions can make him seriously ill, whether they are raw, cooked, or in powdered form.

Onions are toxic to canines because of the substance they contain known as thiosulfate.

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Dogs develop hemolytic anemia if they eat enough onions. I don't think that it matters too much whether the onions are cooked or not. The quantity of onions required is high enough that dogs can generally tolerate small doses of onions without any problem and moderate amounts of onion without clinically apparent disease, even though there may be measurable changes on lab test results. Cats are probably a little more sensitive to onion toxicity than dogs are. I can't find an exact quantity of onions required to cause toxicity problems in dogs, but there are several case reports of onion toxicity and they involve whole onions or sizable portions of chopped onions (like a cup or more). I think that feeding dogs meat that has been cooked with onions is pretty safe but you might want to

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