Clinical judgment required. This calculator is a decision-support tool, not a substitute for veterinary consultation. For poisoning emergencies, call the ASPCA Animal Poison Control Center at 888-426-4435 or your nearest emergency veterinary hospital.

Onion & Garlic Toxicity CalculatorCanineFeline

Calculate onion and garlic (Allium spp.) toxicity risk in dogs and cats. Estimates toxic onion-equivalent dose in g/kg based on allium type and amount ingested. Covers raw onion, cooked onion, onion powder (highly concentrated — 8x raw), raw garlic (3–5x more potent than onion), garlic powder (extremely concentrated), and garlic supplements. Causes oxidative damage to red blood cells leading to Heinz body formation and hemolytic anemia. CRITICAL: cats are more susceptible than dogs. Dogs show toxicity at 15–30 g/kg raw onion, cats at 5 g/kg. Used for Allium toxicology assessment, onion or garlic ingestion emergencies, and Heinz body anemia risk evaluation. Common queries: 'my dog ate onion', 'cat ate garlic', 'dog ate onion powder', 'garlic poisoning in dogs'.

Body Weight

Species

Allium Type

Amount Ingested

Raw Onion Equivalent

—g

Dose per Body Weight

—g/kg (onion eq.)

5 g/kg (onion eq.)

15 g/kg (onion eq.)

30 g/kg (onion eq.)

Non-toxic

Mild

High

Lethal