Is Double King Cup toxic to dogs?

Mildly. The ASPCA lists double king cup as mildly toxic to dogs — a chewing dog typically gets mouth irritation, drooling, and vomiting rather than a medical emergency, but it is still best kept out of reach. Caltha palustris 'Multiplex', like all Caltha palustris cultivars, contains protoanemonin when bruised — a lachrymatory irritant causing mouth irritation, drooling, vomiting, and diarrhoea in pets and humans if ingested in quantity. The Dogs Trust includes the species on its harmful plants list. Wear gloves when handling. Not individually listed by the ASPCA but the genus irritant is well established.

Caltha palustris 'Multiplex', like all Caltha palustris cultivars, contains protoanemonin when bruised — a lachrymatory irritant causing mouth irritation, drooling, vomiting, and diarrhoea in pets and humans if ingested in quantity. The Dogs Trust includes the species on its harmful plants list. Wear gloves when handling. Not individually listed by the ASPCA but the genus irritant is well established. 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 double king cup.

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: Double King Cup is mildly toxic to cats as well. See the full double king cup 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.