Onion and garlic poisoning in dogs is a serious health issue that often goes unnoticed. These common kitchen ingredients contain compounds called thiosulfates, which are toxic to dogs. Even small amounts can damage red blood cells, leading to anemia. Understanding the risks and knowing how to respond quickly if your dog ingests these foods are key to preventing severe complications.

What are the symptoms of onion and garlic poisoning in dogs?
Symptoms of poisoning are not always immediate. In most cases, they appear between 12 and 24 hours after ingestion. Common signs include:
- General weakness and lethargy
- Loss of appetite
- Vomiting and diarrhea
- Reddish or dark brown urine, indicating red blood cell destruction (hemolysis)
- Pale gums and rapid breathing, signs of severe anemia
⚠️ Without prompt treatment, onion and garlic poisoning can lead to life-threatening complications.
How is onion and garlic poisoning treated in dogs?
If your dog has ingested onions, garlic, or any food containing these ingredients, immediate veterinary care is essential. Treatment will depend on how much time has passed since ingestion:
- If ingestion is recent: the veterinarian may induce vomiting to prevent toxin absorption
- Supportive care: intravenous fluids to maintain hydration and support kidney function
- Blood transfusion: required in severe cases of anemia caused by red blood cell destruction
Early intervention greatly improves the chances of recovery.
How to prevent onion and garlic poisoning in dogs
The best way to protect your dog from onion and garlic poisoning is prevention. Here are key tips:
- Keep onions, garlic, and leftover foods containing these ingredients out of your dog’s reach
- Be careful when cooking, especially when using sauces, broths, or seasonings with onion or garlic
- Inform family members and visitors about the dangers of these foods for dogs
- Never offer table scraps without checking their ingredients
Prevention remains the most effective way to keep your pet safe and healthy.