Hi, Robin and welcome to the forum. 
The following website is an excellent source of information on plants that are toxic to animals:
http://www.aspca.org/pet-care/poison-control/plants/
Here is what it says about the hibiscus plant:
http://www.aspca.org/Pet-care/poison.../hibiscus.aspx
Hibiscus
Additional Common Names: Rose of Sharon, Rose of China
Scientific Name: Hibiscus syriacusFamily: Malvaceae
Toxicity: Toxic to Horses, Toxic to Cats, Toxic to Dogs
Toxic Principles: Unknown
Clinical Signs: Vomiting, diarrhea, nausea, anorexia.
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"The animals share with us the privilege of having a soul." -Pythagoras
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Kitties: Punky (17), and Sassy (13), Twinky (10),
Sweet  Mickey  1991 to May 24, 2009
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