Well that interesting exchange got ugly quickly. I don't know if there's any reason to block one another though. Lefty adds a lot of value in this thread. I know of one Rottweiler who came on a property where there was a kenneled Tosa (the brother of my dog Dempsey) and began fence fighting him. The Tosa smashed through some heavy gauge wire and crushed the Rott's skull. To make amends, the Tosa's owner gave the Rott's owner a Tosa puppy out of his next litter and everybody was happy. Pretty sure I wouldn't be happy if it was my dog that had his head crushed. Albeit that he should not have been roaming free, but shouldn't the Tosa have been more properly contained? What if it was a kid that was heckling him through the fence?