Dog Poo Digester

A while back, I got a bit annoyed at the quantity of land mines that Athena was leaving. That, plus the frequency, plus the location (always right by the gate and next to the driver’s side doors of the cars).

To this day, she is continues her campaign of maximum inconvenience.

I know, it’s one of the joys of having a large dog that lives mostly on veggies. Our biggest problem is getting rid of it all.

Pondering the problems of smell and hygiene lead me to think of an anaerobic way to compost it that would keep it out of sight and out of mind.

I came up with this system of in-ground Bokashi composting that uses old tiling buckets and deep holes.

You will need to make multiple bins. When one is full, you start to fill the next, allowing the contents of the first to decompose peacefully. We’ve found that a three bin cycle works for us. By the time the third bin is full, the first is ready for emptying and the cycle repeats.

How to do it…and how to use it…

Step 1

Drill a couple of holes around the wall of the bucket, a couple of inches up from the base. Then drill a couple of holes in the base. I made my initial holes 30mm, but on the second try, reduced them to 20mm.

These holes are for drainage, and to let worms in later on. It’s pretty rough when you haul up a bucket after a couple of months and it’s full of black, smelly liquid!


Drill some drainage holes into the bucket


Step 2.

Cut some sort of cover that can act as a plunger. Because Bokashi is an anaerobic process, it’s good to press the poo and bran down firmly when you put it in the bucket.

I tend to use a shovel to press it, that puts a good distance between me and the mess.

I’ve found that the bottom cut out of one of the small buckets works well and can slide down nearly to the bottom of the big one.

I add a strip of wood as a handle. Don’t want to be prising the plastic off of the muck by hand again!


Make a cover to push the mess down with


Step 3

Dig a hole deep and wide enough to fit the bucket in. Then, put the bucket in it and fill around the sides with dirt.


Put it in the ground


Step 4

Put a big handful of Bokashi bran in the bottom of the bucket. I’ve added some comfrey leaves too to kick off the composting. You can add anything that you think will work.

Step 5

Add the excrement, then another big handful of bran.


Add the poo every couple of days and lightly cover with bran


Step 6

Put the lid/plunger on top and press down firmly, expelling as much air as possible.


Push it down firmly


Step 7 – The last step

Put the lid on the big bucket and cover it with dirt. The extra dirt on top helps slow oxygen getting in as well as stabilising the temperature.


Put the lid on and cover with soil


Repeat steps 5 – 7 until the bin is full, cover it with a layer of dirt, then move on to the next bin.
Using the system.

We’ve found that with Athena, being the kind of dog she is, three of these bins are the amount we need in the warmer weather. I’ve just added a fourth bin for winter to compensate for the lower temperatures slowing the bacterial action.

You’ve really got to try a couple of bins to see how the system suits your dog’s output.

Every day we clean the paths, the produce goes into a small bucket. Every two or three days the contents of this bin goes into the Bokashi bin that is currently in use.  By only adding it every few days, we minimise the amount of fresh air entering the bin.

As I mentioned, we now have four bins, they are numbered and positioned so that when one is full, the next one in sequence is at the maximum distance from the previous. It’s just a precautionary thing to minimise any kind of build up that may occur.

They are also positioned by trees and perennials and away from our daily vegetables. Once again, this is a precaution to minimise the risk of any kind of pathogens reaching our daily veggies.

What to expect when you open the bin?

Well, it’s quite surprising. There’s only a faint fermenting kind of smell, kind of like vinegar. The solid material is dark and crumbly and full of worms.

Worms love this stuff! After the initial Bokashi composting bacteria have done their work, worms move straight in and make it their home. Then they convert all that organic material into even better compost.

Can you put it on your garden?

We’ve had no problems putting it straight onto the garden, though I usually bury it in the mulch or fresh compost to help the worms enjoy their lives. By this time, the anaerobic bacteria (the ones that would normally cause sludge and smell) have long departed.

If you decide to err on the side of caution and add the fresh compost to an aerobic compost heap, it will kick off that heap remarkably well as all the nutrients that came out of the end of your dog are now readily available for the aerobic bacteria to feed on.

How much do you get?

It’s really a worthwhile process. From three bins, we get about 30kg of rich fertiliser for the garden and the cycle takes about three months in the warm weather.

We don’t get the 30kg in one hit, the first bin is emptied after the last is full. This takes about two months. Each bin yields about 10kg. It may be different for you.