Build Your Own Pet Waste Digester

DIY Instructions for a Dog Septic Tank
By The Bark Editors, September 2011, Updated March 2020
Build your own Pet Waste Digester

As a dog person the fate of dog waste is something that’s probably never very far from your thoughts especially when picking up dog poop in the yard. Making an in-ground pet waste digester or a dog poop processor is a pretty easy weekend project. These DIY dog waste composters divert dog waste from landfills and instead kept in your own backyard, only in an enviornmently friendly way. They work similarly to a home septic system by converting the waste to liquid which can escape through the subsoil.

Instructions for Making a DIY Dog Poop Disposal System

1. Take an old plastic garbage can and drill a dozen or so holes in the sides.
2. Cut out the bottom. (A keyhole saw works great for this.)
3. Dig a hole deep enough for the garbage can.
4. Toss some rocks or gravel in the hole for drainage and position the garbage can so it’s a little above ground level.
5. Place the lid on top. (You might want to paint something like “Dog Waste Composter” across the lid.)
6. Start scooping.

When you add poop to the bin, sprinkle in some septic starter (available at hardware stores or Amazon) and add some water.

“Within 48 hours, the septic-tank starter (which is noncaustic and promotes natural bacterial growth) will have begun its work and you can add more dog doo,” explains Michael Levenston, executive director of the City Farmer program in Vancouver, Canada, from which these instructions are adapted. “You can then begin to add it daily. This waste biodegrades and flows into the subsoil.”

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The holes drilled into the side of the can, help with the fluid and gas exchange with the soil. As the pile of dog poop begins to grow the holes on the side on the bucket, help ensure proper flow. Check in at least once a week to be sure to see the dog poop composting cleanly, add more septic starter and water as-needed.

For those less DIY inclined, check out the Doggie Dooley 3000. It is available through Amazon, along with a few other places. The flip-top lid is a nice feature common to all of Doggie Dooley's products.

Winter Weather

During the colder temperatures of winter months, this diy doggie doo dissolver will still work but more slowly. The microorganisms that breakdown dog poop are less efficient in colder temperatures. So, in colder areas, more frequent check-ins are required. If things seem to be slowing down, then an extra dose a septic system treatment and water will encourage faster breakdown within the dog septic tank. Once spring resumes, the system will pick right back up helping to cleanly dispose of the dog doo.

(Important note about dog poop compost: Do NOT use composted dog waste in your garden.)

While burying a garbage can to compost dog waste might seem like overkill if you live near the woods or close to a patch bushes, dealing with dog waste in an environmentally friendly manner is always a good thing.

By the way, if you know someone who lives in a city, the cityfarmer.info website is loaded with all kinds of helpful urban agriculture tips.