Mon chien a mangé de l'oignon : Que faire maintenant
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Que faire maintenant
- 1
Call Your Vet
Contact your veterinarian or ASPCA Poison Control at (888) 426-4435. Note the amount and type of onion consumed.
- 2
Vet May Induce Vomiting
If ingestion was recent (within 2 hours), your vet may induce vomiting to prevent further absorption of thiosulfate compounds.
- 3
Monitor for Anemia Symptoms
Watch for weakness, pale gums, rapid breathing, and reddish-brown urine over the next 1-3 days.
- 4
Blood Work May Be Needed
Your vet may recommend a CBC blood test to check for Heinz body anemia, which confirms onion toxicity.
La science derrière
Les oignons contiennent des composés de thiosulfate (n-propyl disulfure) que les chiens ne peuvent pas métaboliser. Ces composés provoquent des dommages oxydatifs aux globules rouges, formant des corps de Heinz — de l'hémoglobine endommagée qui précipite à l'intérieur de la cellule. La rate détruit ensuite ces cellules endommagées, entraînant une anémie hémolytique. Ce processus prend 1-3 jours, c'est pourquoi les symptômes sont retardés (ASPCA, 2023).
Questions fréquentes
How much onion is toxic to dogs?
Onion toxicity occurs at approximately 0.5% of the dog's body weight. For a 20kg (44lb) dog, this equals about 100g (3.5oz) of onion. All forms are toxic: raw, cooked, powdered, and dehydrated. Onion powder is especially concentrated and dangerous.
How long after eating onion do symptoms appear?
Symptoms typically develop 1-3 days after ingestion as red blood cells are progressively destroyed. Early signs include weakness, pale gums, and reddish urine. Severe cases can lead to collapse and require blood transfusion.
Are all onion types toxic to dogs?
Yes — all Allium species are toxic: onions, garlic, leeks, chives, and shallots. Garlic is less toxic per gram but still dangerous in quantity. Cooking does not reduce toxicity. Onion powder is the most concentrated form.