kanga,
I cant believe I over looked that, yes all cherry trees are toxic, I guess I got side tracked on the weeping part and for some reason was thinking willows???
Red tips are toxic, and yes wisteria too, some juniper berries are too. There's a wide range or ornamental plants that are toxic to animals, that's why I always used the dug up wild ones, most of them are safe, hey and they are free.
all willows are fine, river birch, elms, dogwoods, wax mytrles, etc