Can Dogs Eat Onions?
Find out if onions is safe for dogs and cats.
Think your pet ate something toxic?
Call ASPCA Animal Poison Control Center: (888) 426-4435 or view emergency guide
Onions
Onions are toxic to dogs and cats in all forms, including raw, cooked, dehydrated, and powdered. They contain compounds that can damage red blood cells, leading to hemolytic anemia. Symptoms may be delayed for several days.
Even foods seasoned with onion powder, such as broths, soups, and processed meats, can be dangerous. If your pet ingests onions, contact a veterinarian immediately. Do not wait for symptoms to appear.
Is Onions Safe for Dogs?
Toxic. Damages red blood cells and can cause life-threatening anemia.
Is Onions Safe for Cats?
Toxic. Even small amounts can damage red blood cells.
Preparation Notes
Do not feed any form: raw, cooked, powdered, or dehydrated.
Recommended Amount
None.
How Often?
Never.
Symptoms to Watch For
- weakness
- lethargy
- pale gums
- red or brown urine
- vomiting
- diarrhea
- rapid breathing
What If My Pet Ate Onions?
Contact your veterinarian or a poison control hotline immediately, even for small ingestions. Monitor for delayed symptoms.
Safe Alternatives
Sources
- ASPCA
- Pet Poison Helpline
- Cortinovis & Caloni, Front Vet Sci (2016)
- Gugler et al., Compend Contin Educ Vet (2013)
- MSD Veterinary Manual — Garlic and Onion (Allium spp) Toxicosis
- Salgado et al., J Venom Anim Toxins incl Trop Dis (2011) — Allium species poisoning in dogs and cats
- ASPCA — People Foods to Avoid Feeding Your Pets
Vet's Note
PetPilot provides general information for educational purposes. While we reference authoritative veterinary organizations, this page has not been individually reviewed by a veterinarian for your specific pet. Individual animals may react differently based on age, weight, breed, health conditions, and amount consumed. Always consult your veterinarian or a poison control center for personalized advice, especially if your pet is ill, injured, pregnant, nursing, or on medication.