How can I block/cover my foundation grates?

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Three of the grates covering openings (for ventilation) in my foundation are missing. (My house is almost 100 years old). One of my dogs likes to crawl through them, under the house, and out into the neighbor's driveway. I think he wants to visit their dogs, but it means that he's loose outside the fence, and I live on a busy street. How can I secure them, and keep him safe?

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