Answer: Consider using corn gluten meal on your lawn. It won't take care of the weeds as quickly as weed 'n feed, but it will be safe for the dog, and will help build up the organic content of your lawn as well.
Corn gluten meal is typically applied to lawns with a spreader.2 Most corn gluten meal suppliers suggest that between 12 and 20 pounds of corn gluten meal be applied per 1000 square feet of lawn. Typical recommendations also suggest two applications per year, the first one in the spring and a second one in the fall.
To successfully kill weeds with corn gluten meal, timing is crucial. Remember that corn gluten meal needs to be applied when weed seeds are sprouting. Corn gluten meal suppliers recommend timing spring application when "forsythia begins to bloom," or "two weeks before the first crocus, early daffodils, and blooming tulips" because these flowers bloom at the same time that some common weeds germinate.
In the fall, corn gluten meal suppliers suggest that you apply the product "following the hot, dry stress period of mid-summer," usually "some time between mid-August and mid-September."
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