Things that might keep you dog safe
Do Not use Chemical Lawn Pesticides or some Herbicides.
http://www.whole-dog-journal.com/issues/15_4/features/Canine-Malignant-Lymphoma-and-Lawn-Pesticides_20494-1.html?s=FB030513
http://www.justottawa.com/index.php?option=com_content&task=view&id=101&Itemid=69