Here is a good link to poisonous plants since spring is here. Geez, my brother and I used to eat an occasional red clover and they tasted good...never knew they were poisonous!
http://www.ansci.cornell.edu/plants/comlist.html
I have to watch Honey..she likes to graze. I yell at her to stop, but she will do that when she can. She doesn't eat plants, just grass, but you never know and I have Lilly of the Valley and Bleeding Hearts (didn't know they are bad, too).