This sign says it all.................
http://www.stopsignsandmore.com/p-1781-guard-dog-how-fast-can-you-run-sign-18x18.aspx?gclid=CM2-36LD5b0CFYFhMgoduRcATA
I walked by an empty police car a while back and I didn't even THINK to look for dogs. WELL, the two German Shepherds in the back of their car let me know that I was WAY, WAY too close to THEIR car.
WOW, scared the holy PIE outta me!
I have two German shepherds and I like your sign. lol