Onions contain compounds called disulfides and thiosulphates which can be toxic cats and dogs if ingested.
The ingestion of Onions causes conditions called hemolytic anemia, Heinz body anemia, and methemoglobinemia which are all manifestation of damage to red blood cells.
Onions are not good for dogs.. Onion in all forms - powdered, raw, cooked, or dehydrated - can destroy a dog's red blood cells, leading to anemia. Hope this helped..
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