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That's a lot of poop! The book "Humanure" may have some design ideas for you. I think I would dig a hole and have an outhouse-style hole with a lid so I could open the hole, drop in the poop, add straw or other high-carbon, low-nitrogen material, and a small amount of water. I would be trying for hot composting, but I would suggest getting good at hot composting before trying it with dog waste.