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D2003-44

Dear Daisy Dog

I read your recent column about dogs that eat grass. My dog also eats grass, sometimes shortly after I’ve sprayed it with the grass killer Roundup. Is Roundup safe for dogs?

Daisy Responds

While I, too, like to eat grass, I don’t relish the idea of ingesting herbicides.

If the Roundup is still wet on the surface of the grass when it’s eaten, it can cause vomiting.

Once it’s dry, it seems to be safe. Studies in which Roundup was fed to dogs, rats and mice in huge doses didn’t show any long-term problems, including cancer.

The dogs in these studies were fed the active ingredient in Roundup, glyphosate, at 500 mg per kilogram of body weight per day.

That’s 10,000 mg of glyphosate daily for a 44-pound dog like me. And that translates to a daily dose of just under 1/4 cup of the concentrated Roundup product we have in our garage.
While it’s best to keep your dog off the grass until the Roundup dries, a few blades of grass covered with dried Roundup shouldn’t cause any harm.

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