If your dog just ate it within the last 60 minutes you can get the dog to vomit it up by using fresh 3% hydrogen peroxide which you can read about scrolling down on this pagehttp://www.petplace.com/dogs/how-to-induce-vomiting-emesis-in-dogs/page1.aspx Do this only on an easily cleaned surface and some people have the dog stand in the tub to vomit so clean up is easy.
I did see it listed on a toxic plants list but often all that means is the plant sap is an irritant which can bother mouth or esophagus and may cause vomiting or diarrhea.
I don't see it listed as a deadly toxin.
Hope this helps you!
Dog Expert:Rescue, Train,Breed,Care
30+ yrs dog home vet care & nursing, rescue, behavior&training, responsible show breeding, genetics