Pet safety
Is 'Walla Walla' Oniontoxic to cats & dogs?
Allium cepa 'Walla Walla'
Quick verdict — at a glance
- Toxic to cats?
- Yes — toxic
- Toxic to dogs?
- Yes — toxic
- ASPCA classification
- Toxic to pets · botanical name Allium cepa 'Walla Walla'
Is 'walla walla' onion safe for cats and dogs?
Toxic — the ASPCA lists 'walla walla' onion as a clear no for cats and dogs. The painful part for the pet is usually quick and intense; the right move is to keep it out of any room a pet roams unsupervised. This classification follows the ASPCA Toxic and Non-Toxic Plant List, the most widely used reference for companion-animal plant safety in the US and the standard most UK vets cite as well. Onion (Allium cepa), this cultivar's species, is listed by the ASPCA as toxic to dogs, cats, and horses. The toxic principle is N-propyl disulfide, which causes oxidative damage to red blood cells leading to Heinz-body haemolytic anaemia. Signs include vomiting, weakness, rapid heart rate, panting, and blood in the urine; all onion parts are dangerous raw, cooked, or dried.
| Pet | Toxic? | Per ASPCA |
|---|---|---|
| Cats | Yes | Toxic to pets |
| Dogs | Yes | Toxic to pets |
What happens if a pet eats 'walla walla' onion?
Onion (Allium cepa), this cultivar's species, is listed by the ASPCA as toxic to dogs, cats, and horses. The toxic principle is N-propyl disulfide, which causes oxidative damage to red blood cells leading to Heinz-body haemolytic anaemia. Signs include vomiting, weakness, rapid heart rate, panting, and blood in the urine; all onion parts are dangerous raw, cooked, or dried. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to 'walla walla' onion, treat it as a suspected ingestion and act on the steps below.
What to do if your pet ate 'walla walla' onion
- Remove any plant material from your pet's mouth and move 'walla walla' onion out of reach.
- Note how much was eaten and when, and watch for drooling, vomiting, or lethargy.
- Do not induce vomiting unless a vet or poison-control specialist instructs you to.
- Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice.
- Bring a leaf or photo of 'walla walla' onion to the appointment so it can be treated correctly.
This page is general guidance, not veterinary advice. Pets vary, and a reaction may be to soil, fertiliser, or pesticide rather than the plant. If you are worried, always contact a vet or the ASPCA Animal Poison Control Center on (888) 426-4435 — do not wait for symptoms to worsen.
Pet-safe alternatives to 'walla walla' onion
Want the same look without the risk? These plants are listed as non-toxic to cats and dogs by the ASPCA and have similar care needs:
- Cucumber — non-toxic to cats and dogs (care guide)
- Lettuce — non-toxic to cats and dogs (care guide)
- Bean — non-toxic to cats and dogs (care guide)
- Pea — non-toxic to cats and dogs (care guide)
'Walla Walla' Onion and pets — frequently asked questions
Is 'walla walla' onion toxic to cats?
'Walla Walla' Onion (Allium cepa 'Walla Walla') is toxic to cats according to the ASPCA. Onion (Allium cepa), this cultivar's species, is listed by the ASPCA as toxic to dogs, cats, and horses. The toxic principle is N-propyl disulfide, which causes oxidative damage to red blood cells leading to Heinz-body haemolytic anaemia. Signs include vomiting, weakness, rapid heart rate, panting, and blood in the urine; all onion parts are dangerous raw, cooked, or dried. Keep it out of reach and contact your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 if your cat chews it.
Is 'walla walla' onion toxic to dogs?
Per the ASPCA, 'Walla Walla' Onion (Allium cepa 'Walla Walla') is toxic to dogs. Dogs often chew more enthusiastically than cats, so a toxic plant like 'walla walla' onion is best removed from the floor and low shelves entirely.
What happens if my pet eats 'walla walla' onion?
Onion (Allium cepa), this cultivar's species, is listed by the ASPCA as toxic to dogs, cats, and horses. The toxic principle is N-propyl disulfide, which causes oxidative damage to red blood cells leading to Heinz-body haemolytic anaemia. Signs include vomiting, weakness, rapid heart rate, panting, and blood in the urine; all onion parts are dangerous raw, cooked, or dried. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to 'walla walla' onion, treat it as a suspected ingestion and act on the steps below.
What should I do if my cat or dog ate 'walla walla' onion?
Stay calm. Remove any remaining plant material from your pet's mouth and take the plant away so they cannot eat more. Note roughly how much was eaten and when. Do not make your pet vomit unless a vet or poison-control specialist tells you to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 (a consultation fee may apply) and follow their advice. Bringing a photo or a leaf of 'walla walla' onion to the appointment helps the vet treat it correctly.
What are pet-safe alternatives to 'walla walla' onion?
If you want a similar look without the risk, good non-toxic swaps include cucumber, lettuce, bean, pea. All of these are listed as non-toxic to cats and dogs by the ASPCA, so they suit a home where pets have access to your plants.
Full 'walla walla' onion care
Pet-safety is one piece of the picture. For light, watering, soil, and troubleshooting, see the complete 'walla walla' onion care guide, or browse the full pet-safe plant library to check another plant before you buy it.