Is Myriophyllum spicatum toxic to dogs?

Mildly. The ASPCA lists myriophyllum spicatum 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. Myriophyllum spicatum is not individually listed on the ASPCA Toxic/Non-Toxic Plants database, so its pet status is uncertain. Treat with caution as a non-food plant, discourage pets and livestock from grazing it, and verify with a vet if ingestion is suspected.

Myriophyllum spicatum is not individually listed on the ASPCA Toxic/Non-Toxic Plants database, so its pet status is uncertain. Treat with caution as a non-food plant, discourage pets and livestock from grazing it, and verify with a vet if ingestion is suspected. 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 myriophyllum spicatum.

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: Myriophyllum spicatum is mildly toxic to cats as well. See the full myriophyllum spicatum 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.