Can dogs eat onions?
No, dogs cannot eat onions. Onions are toxic to dogs in all forms — raw, cooked, fried, powdered, or dehydrated.
Why are onions toxic?
Onions contain compounds called disulfides and thiosulfates, which cause oxidative damage to dogs’ red blood cells. This leads to the destruction of these cells, resulting in a condition called hemolytic anemia.
All forms are dangerous
| Form | Toxic? |
|---|---|
| Raw | Yes |
| Cooked | Yes |
| Fried | Yes |
| Powdered | Yes (more concentrated) |
| Dehydrated | Yes (more concentrated) |
Onion powder is particularly dangerous because it’s present in many processed foods such as broths, canned soups, seasonings, and sauces.
Dangerous amounts
Ingestion of approximately 15-30g of onion per kg of body weight is considered toxic. For a 10kg (22lb) dog, that’s roughly half a medium onion. However, toxicity can be cumulative — small amounts consumed over several days can also cause damage.
Other foods in the same family
All members of the Allium family are toxic to dogs:
- Garlic — toxic (though less so than onions)
- Chives — toxic
- Leeks — toxic
- Shallots — toxic
Symptoms of poisoning
Symptoms can take 1 to 5 days to appear:
- Vomiting and diarrhea
- Loss of appetite
- Lethargy and weakness
- Pale or yellowish gums
- Dark urine (reddish or brown)
- Rapid breathing
- Elevated heart rate
What to do
- Seek veterinary care immediately, even for small amounts
- Report the type of onion, the amount, and when it was eaten
- Do not try to induce vomiting on your own
- The vet may order blood tests to evaluate red blood cells
Prevention
- Never give table scraps seasoned with onion
- Read labels on processed foods — many contain onion powder
- Keep onions out of reach in the kitchen
- Be careful while cooking: pieces can fall on the floor
This article is informational and does not replace a veterinary consultation. In case of emergency, seek veterinary care immediately.