The Dangers of Onions and Garlic for Dogs

Posted by Oreo the Labrador on Thu, Sep 29, 2022

Onions and garlic are popular ingredients in many foods, but they can be dangerous for dogs.

While these two ingredients are not toxic to dogs themselves, they can cause a variety of health issues if ingested.

Dogs can suffer from anemia, gastrointestinal issues, and even organ damage if they consume onions or garlic.

It is important to be aware of the symptoms of onion and garlic poisoning in dogs, and what to do if your pet has ingested either of these ingredients.

What Are Onions and Garlic?

Onions and garlic are both members of the Allium family. Onions are a bulbous vegetable, while garlic is a type of root vegetable.

Both of these ingredients are used in many dishes for their distinctive flavors, and can be found in many cuisines around the world.

Why Are Onions and Garlic Dangerous for Dogs?

Onions and garlic contain a compound called thiosulfate. In dogs, this compound is toxic and can cause a condition known as hemolytic anemia.

This occurs when the thiosulfate destroys red blood cells, leading to anemia. Ingesting large amounts of onions or garlic can lead to severe anemia, which can be fatal if not treated properly.

Symptoms of Onion and Garlic Poisoning in Dogs

If your dog has ingested onions or garlic, they may exhibit a variety of symptoms.

The most common symptom is vomiting, which can occur within minutes to hours of ingestion.

Other symptoms may include:

  • Diarrhea
  • Lethargy
  • Loss of appetite
  • Pale gums
  • Dark urine
  • Rapid breathing
  • Jaundice (yellowing of the skin and eyes)

If your dog has ingested onions or garlic, it is important to seek veterinary care immediately. Anemia can be deadly, and can cause organ damage if not treated quickly.

Treatment for Onion and Garlic Poisoning in Dogs

If your dog has ingested onions or garlic, your veterinarian will likely recommend a blood transfusion.

This will help replenish red blood cells that have been destroyed by the thiosulfate. In some cases, your vet may also recommend a special diet to help your pet recover.

This may include supplements or medications to help restore the balance of electrolytes in your pet’s body.

Prevention of Onion and Garlic Poisoning in Dogs

The best way to prevent onion and garlic poisoning in dogs is to avoid feeding your pet these ingredients.

If you do choose to feed your pet foods containing onion or garlic, make sure to feed them in small amounts and monitor their health closely.

It is also important to keep these ingredients out of reach of your pet.


Onions and garlic can be dangerous for dogs if ingested. These ingredients contain a compound called thiosulfate, which can be toxic to dogs and can cause a condition known as hemolytic anemia.

Symptoms of onion and garlic poisoning in dogs include vomiting, diarrhea, lethargy, and jaundice.

If your dog has ingested onions or garlic, it is important to seek veterinary care immediately. Treatment for onion and garlic poisoning may include a blood transfusion or a special diet.

The best way to prevent onion and garlic poisoning in dogs is to avoid feeding them these ingredients, and keep them out of reach of your pet.