Every dog is different. Individual allergies and sensitivities are common — always introduce new foods in small amounts and watch for adverse reactions. This site is for informational purposes only and is not veterinary advice. Always consult your vet.
The Full Picture
All parts of onions (flesh, leaves, juice, powder) are toxic to dogs. Onions contain N-propyl disulphide, which damages red blood cells and causes haemolytic anaemia. This applies to all forms: raw, cooked, fried, powdered, or dehydrated. Symptoms include lethargy, weakness, decreased appetite, pale gums, fainting, and reddish urine. All members of the allium family (garlic, leeks, chives, shallots) are also toxic. Even small amounts consumed regularly can be harmful.
What You Should Know
Onions should be kept well away from dogs. If your dog has eaten onions, watch for symptoms such as vomiting, diarrhea, lethargy, or loss of appetite. In an emergency, contact your veterinarian or an animal poison helpline straight away.