The non member are getting in because it is a public group, which means any member of flickr can join, I just look at the pictures posted and if I recognize the dog/cat/pet then I leave it, if I don't recognize it then I send a message to the poster of the pics, if I don't hear anything back within a week, that person has their pics removed from the group and is removed from the group. Now that I have added the rules to the group, there are way less people that have joined without being a member of the forum.
I am probably just going to let the group go, it will still be there but who ever joins, joins. Only a couple member added photos and that was it, if someone else started the group, I'm sure it would be doing alot better.
also, I think instead of having this thread stickied, it would make more sense to have the original one stickied.