Is guelder rose toxic to dogs?

Mildly. The ASPCA lists guelder rose 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. Viburnum opulus is not listed as toxic on the ASPCA's toxic-plant list for dogs or cats; however, the raw berries contain viburnin, a mildly toxic compound that causes nausea and vomiting in humans if eaten unripe or in quantity. Cooked berries are traditionally used in jams. Treat with caution around children and pets.

Viburnum opulus is not listed as toxic on the ASPCA's toxic-plant list for dogs or cats; however, the raw berries contain viburnin, a mildly toxic compound that causes nausea and vomiting in humans if eaten unripe or in quantity. Cooked berries are traditionally used in jams. Treat with caution around children and pets. 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 guelder rose.

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: guelder rose is mildly toxic to cats as well. See the full guelder rose 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.