About 15 years ago, I dug a hole in the back of my ornamental garden, away from my food crops. The hole is about 3 feet wide and 3 feet deep, and is covered with a plastic lid from an old compost bin. I empty my dog’s waste in the pit every day so that it will break down as compost.
Occasionally I add Septo-Bac, an enzyme-active biological compound formulated to increase the digestion rate of sewage.
I haven’t had to empty the hole for over 6 years. When I did empty it, I dug a hole under some nearby shrubs, put the nearly composted waste in and covered it with soil.
Next time I empty it, I will line the sides of the pit with 1/2 inch hardware cloth because my soil is very sandy and tends to cave in a bit.
I am also starting to add some chopped yard waste (green and brown) to hasten the process. The finished dog waste compost can be used on ornamentals, but not on food crops. Dog waste is not allowed in garbage bins, so this alternative has served me well.
See City Farmer’s Step-By-Step photo guide to making a dog waste composter in your back yard.