Dogs should not eat onions. All types of onions—raw, cooked, powdered, or dried—are toxic to dogs because they contain a compound called N-propyl disulfide. This compound damages dogs' red blood cells, leading to a condition called hemolytic anemia, where the body destroys red blood cells faster than it can produce new ones. The symptoms of onion toxicity may not appear immediately and can include lethargy, weakness, pale gums, vomiting, diarrhea, and in severe cases, collapse or death. Even small amounts of onion, including onion powder or food flavored with onions, can be harmful, especially to small dogs and puppies. Other members of the onion family (Allium), such as garlic, chives, leeks, and green onions, are also toxic to dogs. Cooking or frying onions does not reduce their toxicity. If a dog eats onions, immediate veterinary attention is necessary. In summary, dogs should never be given onions or any food containing onion ingredients due to the serious health risks.
