When you walk your dog just think of the many times that you fertilized the neighbors grass. Our dogs always found a new place to help the poor starving grass. But, for my yard, I always religiously spread Vigoro on the grass. Thus the dogs going by need not help me out on my gardening endeavors. I do remember accidentally fertilizing the oriental rug at the front door(not to mention the car), because of some helpful dog passing by the house.