Unlike humans, onions in any form, including garlic are very toxic to dogs and cats as well as most of our other domestic animals, causing breaking of the red cells of the blood with leakage of the haemoglobin into the plasma of the blood and anaemia with kidney damage. The poisoning can happen when dogs are wormed with garlic (incorrectly 'cos it doesn't work in any species at all) or if the stew with onions is fed. Every so often a farmer will buy a truckload of reject onions from the vegetable processor to feed to stock...with consequent heavy losses through death. I have seen it too many times. One farmer lost 32 dairy cows (in full milk) in a herd of only 100. 

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