Dog friendly plants
There are definitely plants in the environment for your dog to avoid and many of them don't know the difference. It is good that you are concerned.
One thing to watch for are mushrooms of any variety in your yards. They are very toxic for small animals and children My number one caution plant.
Here is a website that you can read about poisonous plants: http://www.aspca.org/pet-care/poisoncontrol/plants/
Good starters for you would be mahonia, euonymous, pittosporum, roses, deutzia and fatsia.
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