I could interpret the logo two different ways.

1- The dog/owner is symbolic of perpetrators and poses a warning that it is the owner who poses the threat as he/she is the one essentially disrespecting you by allowing their animal to pee on your property. This was the first way I interpretted the logo. In this image the dog would simply pose as the symbol for the method by which the owner harms you. "Don't shoot the messenger" type of mentality.

2- Anthony's interpretation to beware of the owner who has PTSD. I respectfully disagree with this interpretation as it implies that someone who suffers from PTSD is automatically someone who is volatile and dangerous, and I think there are equal amounts of PTSD who internalize all of their reactions rather than to externalize them towards other people.

3- A third interpretation could be that the one suffering PTSD is the dog itself due to mistreatment by the owner.

As I mentioned, the first one I saw was scenerio 1. Also, Im looking at the logo at the top of the forums and dont know where a gun came into play because I do not see it on my screen so perhaps im not looking at the same logo as everyone else.

In my guild on World of Warcraft we have made up the myth of ManBearPig and I think ManBearPig would be a more fitting mascot for the forums as it would symbolize the fact that everyone is both human(man), yet has the capacity to be dangerous and reactive (bear), and that we can be given to overindulging our instincts of finding the rescuer or self harm (pig)...

But then I tend to overthink these things ;)