This is dog poo etiquette but is a huge bugbear of mine at the moment.
If you are out somewhere in the middle of nowhere, like a forest or a bridle path that is seldom used. Somewhere infrequently used by hoards of the general public. NOT a park, not a beach and not a well trod public footpath.
If your dog has a crap, move it well off the path, and into the undergrowth as far away from human feet as you, and your boot or flicky stick, or inverted poo bag can manage. And leave it there. Nature will take it's course as it does will all other things poo related.
OR
Pick it up in a bag and take it home, or dispose of it in the nearest bin.
DO NOT for the love of God, pick it up in the plastic bag and then hang it from a tree, or leave it at the bottom of a tree, or tuck it into a little cranny in a fallen log.
Jesus wept. Delamere Forest was festooned with hanging shit bags yesterday.
Dog shit au naturelle under a pile of stinging nettles will degrade, dog shit in a plastic bag hanging for a branch will not.
Other tip is to smile at other dog owners. Smiling is nice and makes people happy.