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Can onions kill dogs?

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And it nearly killed him. Not surprisingly, pets actually have to eat the onions to get sick, but depending on their size, they may not have to eat much. One fourth of a cup can make a 20-pound dog sick while several cups may be needed to make a large dog sick. Cats are even more sensitive. read more

Normally, in dogs with onion toxicity a moderate number of red blood cells may contain Heinz bodies. In Max's case, most of the red blood cells carried the protein clumps. Heinz bodies don't usually cause life-threatening problems themselves; the red blood cells can still carry oxygen, just not as efficiently. read more

Like the chocolate rule, the stronger the onion the more toxic it can be. Since garlic is part of the onion family it's even more dangerous to dogs than onions per ounce. Garlic contains compounds that are strong in toxicity. read more

Onions are toxic to dogs. The toxicity is dose dependent, so the bigger the animal, the more onion need be consumed to cause a toxicity. Onion toxicity causes a Heinz body anemia. Heinz bodies are small bubble-like projections which protrude from a red blood cell and can be seen when the cells are stained. read more

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