Just got back from the mountain, not sure about the rules here, but I post anyways 
August 19th, the model that never disappoints

there are no special rules.
Take these:
Try to post one shot daily
The shot must feature EXIF data to show it was taken the day it was posted
due to time zone distribution we set the frame from 12 GST to 12 GST next day
we are not very restrictive though. A bit early or a bit late is OK. Leaving out one day is OK
some even post irregularly on a monthly or weekly basis. All fine.
Love your contribution. Great dog shot. Different.