Dog Onion Toxicity Calculator
Calculate the risk of Allium poisoning. Enter your dog's weight and the estimated amount of onion (or garlic) consumed to see if it reaches a dangerous level.
Why are onions toxic to dogs?
Onions contain N-propyl disulfide, a compound that breaks down red blood cells in dogs, leading to a condition called hemolytic anemia. All parts of the onion (flesh, skin, juice) and all forms (raw, cooked, powdered) are toxic.
How much onion is toxic to a dog?
Toxicity usually occurs if a dog consumes more than 0.5% of its body weight in onions at once. For a 20 lb dog, this is only about 1.6 ounces (approx. half a small onion).
What are the symptoms of onion poisoning?
Symptoms include lethargy, pale gums, rapid heart rate, fainting, and reddish-colored urine. These signs may not appear for several days after ingestion as red blood cells are gradually destroyed.
Are garlic and leeks also dangerous?
Yes. Garlic, leeks, chives, and shallots belong to the same Allium family and contain similar toxic compounds. Garlic is actually considered more concentrated and more toxic than onions.