Dog Onion Toxicity Calculator
You must note: This calculator does not replace professional medical advice and should not be the sole basis for clinical decision-making. If you have any concerns, please contact your veterinarian.
Input
- Dog’s weight (kg): The current body weight of your dog in kilograms.
- Onion amount ingested (g): Estimated total weight of onion consumed (raw, cooked, or powdered).
Output
- Onion dose per kg (g/kg): The onion amount divided by the dog’s weight.
- Toxicity Risk Level: Categorized as Low, Moderate, High, or Severe.
- Recommendation: Tailored veterinary advice based on risk level.
Calculation Method
The calculator estimates the toxicity risk by dividing the ingested onion amount (in grams) by the dog’s weight (in kilograms), resulting in a dosage expressed as grams per kilogram (g/kg). Veterinary toxicology literature suggests that:
- Minor symptoms may occur at doses as low as 5 g/kg.
- Hemolytic anemia and other serious effects are likely at or above 15–30 g/kg.
- Severe toxicity is expected at doses over 30 g/kg.
These thresholds are derived from veterinary sources including the Merck Veterinary Manual, Pet Poison Helpline, and ASPCA Animal Poison Control Center.
Risk Levels and Interpretation
| Onion Dose (g/kg) | Risk Level | Veterinary Recommendation |
|---|---|---|
| < 5 | Low | Monitor at home. Contact vet if symptoms appear. |
| 5 – 14.9 | Moderate | Possible toxicity. Contact your vet for guidance. |
| 15 – 29.9 | High | Likely toxic. Veterinary consultation is strongly recommended. |
| ≥ 30 | Severe | Emergency! Seek immediate veterinary care. |
Clinical Symptoms of Onion Toxicity in Dogs
- Vomiting and diarrhea
- Fatigue and weakness
- Pale or yellowish gums
- Rapid breathing or elevated heart rate
- Dark-colored urine
- Loss of appetite
Symptoms may appear 12 to 72 hours after ingestion and worsen over time as red blood cells are destroyed.
When to Contact a Veterinarian
- If the onion dose per kg exceeds 5 g/kg.
- If your dog exhibits any of the above symptoms.
- If the ingested onion was part of a dish with other harmful ingredients (e.g., garlic, xylitol, raisins).
- For puppies, senior dogs, or dogs with pre-existing conditions — contact your vet even at lower doses.
Disclaimer
This tool is designed for informational and educational purposes only. Toxic responses vary by individual pet, and even small amounts may be dangerous in certain cases. Always err on the side of caution and consult a licensed veterinarian.