I need some help finding out what plants are safe for dogs. We're getting ready to replace some trees in our backyard and add some other plants and for the trees we were thinking of Shamel Ash and Purple Leaf Plum but I cannot find if they are poisonous to dogs or not. Anyone know about these trees or know of a good toxic plant list? The two lists I found listed toxic and non-toxic but these trees weren't in either catagory.