Is Common Water Starwort toxic to dogs?

Mildly. The ASPCA lists common water starwort 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. Callitriche stagnalis is not listed on the ASPCA Toxic and Non-Toxic Plant database and no toxic principles have been identified for this species. As pet-safe status cannot be confirmed by ASPCA, it is classified as mildly toxic as a precaution; aquatic access by pets is generally low, but consult a vet if ingestion occurs.

Callitriche stagnalis is not listed on the ASPCA Toxic and Non-Toxic Plant database and no toxic principles have been identified for this species. As pet-safe status cannot be confirmed by ASPCA, it is classified as mildly toxic as a precaution; aquatic access by pets is generally low, but consult a vet if ingestion occurs. 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 common water starwort.

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 in the US, or Animal PoisonLine on 01202 509 000 in the UK 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: Common Water Starwort is mildly toxic to cats as well. See the full common water starwort 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.