Can dogs eat onion?
No. onion isn't safe for dogs and shouldn't be fed on purpose.
Why
Onions contain compounds that damage red blood cells in dogs and cats, leading to hemolytic anemia. Cooked or raw, fresh or powdered — all forms are toxic.
What to watch for
Weakness, lethargy, pale gums, vomiting, diarrhea, dark-colored urine. Symptoms may take days to appear.
What to do
Call your vet. Even small amounts can add up over time.
If they've already eaten some, don't wait for symptoms
This page is not veterinary advice and is not a diagnosis. It's a general reference for a common food, and it can't account for your pet's size, age, health conditions, medications, or how much they actually ate. Toxicity is almost always about dose. If your pet has eaten something you're worried about — or is showing any symptoms — call your veterinarian, an emergency animal hospital, or a poison control hotline right away. Never induce vomiting unless a veterinary professional tells you to.