Highly Toxic

All parts of the onion plant are toxic to dogs, whether raw, cooked, fried, or powdered (onion powder). Onions contain N-propyl disulfide, a compound that breaks down red blood cells, leading to hemolytic anemia.

Symptoms

Symptoms may take several days to appear after ingestion:

• Pale gums
• Lethargy and weakness
• Fainting
• Reddish urine
• Vomiting

Note: Garlic is approximately 5x more potent than onions. If your dog eats a significant amount of either, contact your vet.