The Doggie Dooley is a backyard septic tank for doggie doo-doo!
The Doggie Dooley provides a simple, hassle-free sanitary way to dispose of pet waste. Simply dig a hole and insert the 4-gallon "septic tank". Step on the lid to drop in pet waste. Enzymes and bacteria inside break down waste so it dissolves harmlessly into the soil without odors or mess.
Link - via Luxury Housing Trends
We have one (a larger model) & it works GREAT - but it only 'digests' waste at temps above 40 degrees.
Waste can be deposited in it year round though, and it's nice for all of us having a doodie-free yard to walk on!