There are so many plants that have toxic qualities that could have ill effects on both canines and felines.
This is the ASPCA list of plants that ARE toxic to canines:
http://www.aspca.org/pet-care/...
This is the ASPCA list of plants that ARE toxic to felines:
http://www.aspca.org/pet-care/...
As you can see, both lists are extensive. I know that sometimes it's pretty hectic taking a pet to the Vet but I'd hope that clients bringing their pets into the Veterinary Clinic would have the sense to keep their furry family members away from live plant material and other things around the waiting room or offices that they could swallow or choke on.