About rule #7, if a user edited his/her screenshot, that entry is automatically disqualified. A screenshot is necessary because it will show that the user has already made 50 posts during the posting of the screenshot.
To clear this up, the screenshot that I am referring to is the screenshot of a user's last post/reply which shows that his/her post count is already 50. This can be seen at the left side of a user's every post. The one under the join date. So it is not possible for a user to post at 2:00 am then post replies to meet the requirement.
About rule #3, this was possible before when we were still using the previous platform. But since we have changed platform, the 50 character rule has been disabled. However, I am monitoring the forum everyday. In case I find spam messages, I send pm to the user informing that his/her post will be deleted. We can disregard the 50 character rule for now but let's make sure that the post/reply will be helpful to shih tzu owners. Thank you for questioning this one as I was not able to review this again when I changed the forum's platform.
I hope this clears the mechanics of the contest. If you still have questions, feel free to post it here.