Why it's dangerous
The plant contains isoquinoline alkaloids which negatively affect the nervous system and gastrointestinal tract of animals.
Toxic compound: isoquinoline alkaloids
Good to know
Bleeding Heart plants are toxic to both animals and humans. They are particularly known to affect cattle and sheep in addition to dogs.
Sources
This page is informational and is not veterinary advice. If your pet has been exposed to something risky, contact your vet or an animal poison control line right away.