What this calculator does
Dog onion toxicity risk works out onion dose eaten checked against published toxicity thresholds for a dog's weight. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaToxic dose ≈ 0.25% of body weight; likely-serious dose ≈ 0.5% of body weight (thiosulphate toxicosis)
The inputs explained
| Field | What to enter |
|---|---|
| Dog weight (kg) | A number, measured in kg. Starts at 10. |
| Onion eaten (raw weight) (g) | A number, measured in g. Starts at 15. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with dog weight
Every other input is held at the calculator’s starting values while dog weight varies. Select any row to load that scenario into the calculator.
How the answer changes with dog weight
| Dog weight (kg) | Risk level | Toxic dose threshold | Likely-serious dose |
|---|---|---|---|
| 5 | Elevated, toxic threshold reached | 12.5 g | 25.0 g |
| 7.5 | Below the toxic threshold | 18.8 g | 37.5 g |
| 10 | Below the toxic threshold | 25.0 g | 50.0 g |
| 15 | Below the toxic threshold | 37.5 g | 75.0 g |
| 20 | Below the toxic threshold | 50.0 g | 100.0 g |
| 30 | Below the toxic threshold | 75.0 g | 150.0 g |