Is Trapa natans toxic to dogs?

Mildly. The ASPCA lists trapa natans 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. Trapa natans is not individually listed on the ASPCA Toxic and Non-Toxic Plants database, so a definitive pet rating is unavailable; treat with caution and verify with a vet. Practical hazards are concrete: the raw nuts are mildly toxic and must be thoroughly cooked before eating, the hard spiny fruit can injure mouths and paws, and the plant readily accumulates heavy metals from its water.

Trapa natans is not individually listed on the ASPCA Toxic and Non-Toxic Plants database, so a definitive pet rating is unavailable; treat with caution and verify with a vet. Practical hazards are concrete: the raw nuts are mildly toxic and must be thoroughly cooked before eating, the hard spiny fruit can injure mouths and paws, and the plant readily accumulates heavy metals from its water. 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 trapa natans.

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: Trapa natans is mildly toxic to cats as well. See the full trapa natans 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.