Dog Onion Toxicity Calculator
Chemistry & BiologyEstimate onion toxicity risk for a dog based on body weight and amount eaten. Not a substitute for veterinary advice -- contact your vet immediately if your dog has eaten onions.
Amount Eaten as % of Toxic Threshold
The amount eaten expressed as a percentage of the toxic dose threshold. 100% or higher means the toxic threshold has likely been reached.
Toxic Dose Threshold (0.25% of body weight)
25.0
Estimated amount of onion, in grams, at which toxicity risk begins.
Serious Toxicity Threshold (0.5% of body weight)
50.0
Estimated amount of onion, in grams, at which serious toxicity risk begins.
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Creators
Odeh Ahwal0people find this calculator helpful
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Saved
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Chemistry & Biology calculators
Frequently Asked Questions
Is this a substitute for veterinary advice?
No. If your dog ate onions and you are unsure of the amount, do not hesitate to seek professional help. Contact your veterinarian or a pet poison control hotline if you are in any doubt.
How much onion is toxic to a dog?
A commonly cited estimate places the toxic threshold at around 0.25% of a dog body weight in onion, with serious toxicity risk around 0.5% of body weight, though individual sensitivity genuinely varies and there is no fully precise safe amount.
Why are onions dangerous to dogs?
Onions contain compounds that damage a dog red blood cells, potentially leading to a serious condition called hemolytic anemia. Because individual dogs vary in sensitivity, it is always safer to treat any known onion ingestion as a reason to contact a veterinarian rather than wait for symptoms.
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