You can make a low wooden platform. I would recommend going bigger than 10x10 for two large dogs. One more set of panels allows you to go to 20x20 or 10x30.I would use untreated plain pine boards and not plywood as they might chew on it. Where do you live?
When I had a run I did 10x30 and did the tarp with an A-frame that would shed snow/ice/rain fairly well.
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