Scallion (green onion)
ToxicScallions are Allium, so they damage red blood cells exactly the way onions and garlic do. Cooking, drying and pickling do not remove the risk, and the anemia shows up three to five days later.
This food guide has not been reviewed by a veterinarian. It summarises general information from sources and should not be used to decide whether a food is suitable for an individual dog or to assess an emergency.
Check before feeding
Do not offer as a treat
There is no recommended treat portion for this hazardous item. If swallowed, contact a vet with the amount, time and product details. Do not induce vomiting yourself.
Signs and health concerns
This list includes both observable signs and conditions identified through examination or testing. It cannot establish the cause or whether an exposure is safe.
- Vomiting
- Diarrhoea
- Loss of appetite
- Lethargy
- Pale gums or mucous membranes
- Weakness
- Fast heartbeat
- Haemoglobin in urine
- Jaundice
More about this food
Scallions, green onions and spring onions all belong to the genus Allium. Merck groups garlic, onions, chives and leeks together and describes the shared mechanism: sulfur-containing oxidants damage red blood cells, form Heinz bodies, and produce methemoglobinemia and hemolytic anemia. Scallions sit inside that group. Cooking, sauteing, drying and pickling do not destroy the compounds.
Be honest about the numbers. No published study measures a gram-per-kilogram toxic dose of scallion in dogs specifically. The working standard is the genus figure: Merck reports clinical signs in dogs after 15-30 g/kg of raw onion. Until scallion-specific data exists, treat scallion at that level. Missing data is not evidence of safety.
In an American kitchen the exposure is rarely a whole bunch of scallions. It is the scallion-heavy dish. Loaded baked potatoes, spinach and scallion dip, scallion cream cheese on a dropped bagel, stir-fries and fried rice, ramen and pho toppings, scallion pancakes, guacamole, and green-onion garnish scraped off plates into a dog bowl. Anything with scallion almost always has garlic or onion in it too, which stacks the dose.
Breed matters. Pet Poison Helpline notes that cats and Japanese dog breeds such as Akitas and Shiba Inus are more sensitive to Alliums. If you have a Shiba or an Akita, assume a smaller amount does more.
The timeline is the trap. Vomiting, diarrhea and lethargy can appear within hours, but Merck states that hemolysis typically occurs three to five days after exposure, and signs usually are not noticed until substantial hemolysis has already happened. Pale or muddy gums, fast breathing, weakness, port-wine or brown urine and yellow eyes are late findings.
Write down what was eaten, how much and when, then call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435. Do not induce vomiting at home. Expect your vet to recheck a CBC at 24 and 72 hours to track Heinz bodies and packed cell volume, and do that recheck even if your dog seems fine.
Frequently asked questions
- My dog licked scallion cream cheese off a bagel. Should I worry?
- Call your vet rather than guess. Scallion dips and spreads usually contain onion or garlic powder as well, which stacks the Allium dose in a small volume. Report your dog's weight, what was eaten and when.
- Does cooking scallions make them safe?
- No. The sulfur oxidants survive cooking, so scallion pancakes, fried rice, soup broth and stir-fries carry the same risk. Dried or powdered scallion is more concentrated per gram, not less.
- It has been two days and my dog seems normal. Are we clear?
- Not yet. Merck notes hemolysis typically occurs three to five days after exposure, so day two tells you very little. Watch gum color, energy and urine color daily, and get the 72-hour CBC your vet recommends.