Dog Onion Toxicity Calculator
Assess the risk level if your dog ate onions, garlic, or other allium vegetables.
Formula
Dose (g/kg) = (amount × allium multiplier) ÷ weight (kg)
- Onions toxic at ~5 g/kg (raw). Garlic is ~5× more potent than onion.
- Any amount can cause harm in small dogs or with repeated exposure.
- Symptoms of allium toxicity include vomiting, weakness, and anemia (Heinz body).
20 lb dog eats 10 g raw onion
Inputs
- Dog Weight: 20 lbs
- Allium Type: onion
- Amount Eaten: 10 g
20 lbs = 9.07 kg. 10g / 9.07 = 1.1 g/kg → Mild Risk.
Frequently asked questions
How much onion is toxic to dogs?
About 5 g/kg body weight for raw onion; less for garlic. Any amount warrants vet consultation.
Is onion powder more dangerous?
Yes. Onion powder is more concentrated than raw onion — 1 g powder ≈ 4–5 g raw onion.