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Onions & Garlic
Human Foods

Is Onions & Garlic Toxic to Dogs and Cats?

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Why Is Onions & Garlic Toxic?

Toxic Compounds: N-propyl disulfide, Thiosulphate

What Happens in the Body: These compounds cause oxidative damage to red blood cells, leading to their destruction (hemolysis). This results in anemia that develops over several days.

Signs of Onions & Garlic Poisoning

If your pet has been exposed to Onions & Garlic, watch for these symptoms:

  • Lethargy and weakness
  • Pale gums
  • Decreased appetite
  • Red or brown urine
  • Rapid breathing
  • Vomiting and diarrhea

What To Do If Your Pet Ate Onions & Garlic

  1. Contact your veterinarian, especially if large amounts were consumed

  2. Symptoms may be delayed 1-5 days, so monitoring is important

  3. Note the type (onion, garlic, etc.) and amount eaten

  4. Watch for signs of anemia over the following days

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Veterinary Treatment

Treatment depends on severity and may include inducing vomiting (if recent), blood transfusions for severe anemia, oxygen therapy, and supportive care.

Information for Veterinarians

Toxic dose: Onions >0.5% of body weight, Garlic >1 clove per 10 lbs. Garlic is more concentrated but onions are more commonly ingested in toxic amounts.

Frequently Asked Questions

Is garlic in dog food safe?

Small amounts of garlic in some commercial dog foods are generally considered safe, but concentrated garlic or supplements should be avoided.

Reviewed by: Dr. Michael Torres, DVM

Last updated: October 15, 2024

Sources: ASPCA, Merck Veterinary Manual

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