Overview

Onions, garlic, leeks, chives, and shallots - all members of the Allium family - are toxic to dogs and cats. These foods contain compounds called organosulfoxides that damage red blood cells, leading to a condition called Heinz body anemia. Cats are significantly more sensitive than dogs. The toxic effects are cumulative, meaning small amounts eaten over several days can be just as dangerous as a single large exposure. Cooked, raw, powdered, and dehydrated forms are all toxic. Many human foods contain hidden onion or garlic powder (baby food, soups, sauces, seasoning blends), so check ingredient labels before sharing food with your pet.

Symptoms

Lethargy, pale gums, red/brown urine, weakness, rapid breathing

Typical onset

1-5 days

What to do

Contact your vet. Cats are especially sensitive. Damage to red blood cells may be delayed.