猫がタマネギを食べた：症状と対処法
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今すぐ猫のリスクを評価
| タマネギの形態 | 摂取量 | リスクレベル | 必要な対処 |
|---|---|---|---|
| Onion powder | > 0.5g | HIGH | 🚨 Vet NOW — concentrated form |
| Raw/cooked onion | > 5g per kg | Moderate | 📞 Call vet today — delayed symptoms |
| Trace amounts | < 1g | Low | 👀 Monitor for 3-5 days |
今すぐやるべきこと
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Step 1: Note the Type and Amount
Was it raw onion, cooked onion, onion powder, or a product containing onion? Powder is most concentrated. Calculate approximate amount.
- 2
Step 2: Call Vet or Poison Control
📞 ASPCA Poison Control: (888) 426-4435. Even small amounts can cause delayed anemia — early blood work may be needed.
- 3
Step 3: Do NOT Induce Vomiting Unless Instructed
⚠️ Symptoms are delayed 1-5 days. Induction is not effective after absorption. Your vet may induce vomiting if ingestion was very recent.
- 4
Step 4: Schedule Blood Work
Your vet will check for Heinz bodies and monitor red blood cell count for 3-5 days. Early detection of anemia allows transfusion if needed.
その背後の科学
タマネギ（Allium cepa）にはN-プロピルジスルフィドおよびS-メチルシステインスルホキシドが含まれています。これらの化合物はヘモグロビンに酸化損傷を引き起こし、ハインツ体（変性ヘモグロビンの沈殿物）を形成します。脾臓が損傷した細胞を取り除き、溶血性貧血を引き起こします。猫は特に脆弱です。なぜならネコ科動物のヘモグロビンは他の種よりも多くのスヒドリル基を含み、酸化に対してより感受性が高いからです。さらに、猫はグルコース-6-リン酸脱水素酵素（G6PD）活性が低く、赤血球を酸化損傷から保護する能力が低下しています。貧血は通常、摂取後3-5日にピークに達します（Merck Veterinary Manual、2023）。
よくある質問
Are onions toxic to cats?
Yes, onions are highly toxic to cats — more so than dogs relative to body weight. Onions contain N-propyl disulfide and thiosulfates that cause oxidative damage to red blood cells, leading to Heinz body hemolytic anemia. Cats are uniquely vulnerable because their hemoglobin is more susceptible to oxidation, and they produce methemoglobin more readily.
How much onion is toxic to cats?
Even small amounts are dangerous. Toxic effects can occur at 5g/kg body weight (about 1 tablespoon for a 4kg cat). Regular consumption of smaller amounts (even trace amounts in baby food or broth) can cause cumulative damage. Raw, cooked, powdered, and dehydrated onions are all toxic.
What are the symptoms of onion poisoning in cats?
Symptoms appear 1-5 days after ingestion: pale or yellow gums (anemia/jaundice), weakness, rapid breathing, reddish-brown urine (hemoglobinuria), vomiting, and lethargy. Heinz body anemia is confirmed by blood smear showing damaged red blood cells. Severe cases require blood transfusion.
Can onion powder hurt cats?
Yes, onion powder is concentrated and especially dangerous. Even small amounts in broth, gravy, baby food, or treats can cause toxicity. Many commercial products contain hidden onion or garlic powder. Always check ingredient labels before sharing human food with cats.