Many humans think that we dogs have a very primitive way of communicating with each other. That we couldn't possibly be sending complex messages via something so simple.
I am here to prove you wrong.
First, locate the site of a fellow dog's important message.
Slowly inhale every bit, byte, and piece via your superior sense of smell. Allow a few moments for your brain to reconstruct the message so that you can understand it. This may take some time and may involve your flavor-saver beard (if you are lucky enough to possess one). Do not allow your human to interrupt - this could be important!
Nothing too important today (no girlie dogs in heat, basically). So just leave a message of your own. Here I am simply leaving my calling card, to let other dogs (and especially squirrels) know that I have been here.
As always, I AM HERE TO HELP