Is 'Walla Walla' Onion toxic to dogs?

Yes — 'walla walla' onion is toxic to dogs according to the ASPCA. Keep it well away from any dog that chews plants; reactions can be significant. 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.

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 — watch for drooling, pawing at the mouth, vomiting, loss of appetite, or unusual lethargy after your dog has had access to 'walla walla' onion.

Stay calm. Remove any plant from your dog's mouth and take the plant away. Note how much was eaten and when, and do not induce vomiting unless told to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice; a leaf or photo helps the vet treat it correctly.

The ASPCA classification Growli uses applies to both cats and dogs: 'Walla Walla' Onion is toxic to cats as well. See the full 'walla walla' onion pet-safety guide for both species.

For a similar look without the risk, see the best dogs-safe plants list — every plant there is ASPCA non-toxic to cats and dogs.