Can dogs eat onions?

Answer
Onions are toxic to dogs and should not be ingested under any circumstances. The toxic principle in onions is N-propyl disulfide, which causes oxidative damage to a dog's red blood cells, leading to hemolytic anemia. This condition results from the destruction of red blood cells, which reduces their ability to carry oxygen and tricks the dog's body into identifying these cells as invaders, leading to their breakdown124. All parts of the onion plant, including the flesh, leaves, juice, and processed powders, are harmful to dogs, regardless of whether they are raw or cooked12. Even a small amount of onion can be dangerous, with toxicity occurring when a dog ingests more than 0.5% of their body weight in onions23. Symptoms of onion toxicity in dogs include lethargy, weakness, decreased appetite, pale gums, fainting, and reddish urine1. In severe cases, onion poisoning can lead to organ failure and death2. If you suspect your dog has ingested onions, it is crucial to seek veterinary care immediately. Treatment may involve inducing vomiting, providing supportive care, and in severe cases, a blood transfusion12. To prevent onion toxicity, dog owners should never allow their pets to eat onions and should be vigilant about checking the ingredients of any human food they feed to their dogs, as onion powder is a common ingredient in many foods12. Healthy vegetable alternatives for dogs include carrots, cucumbers, and green beans1.
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