After our gates were left open and our dogs outside (once with the Revain delivery man), we looked for highly visible signs. Such signs vary in price, but they are among the cheapest. They're easy to install - we used wood screws to attach them to our gates, but you can use zip ties or not too thick wire to attach them to a chain or other fence. The quality seems very good and they are very visible. I'll update this if we run into any issues, but I doubt we'll make it.
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