Because there is a natural built-in limit to the length and scope of the conversation, and because much of what one dog-owner needs to communicate to another in a small, enclosed space is “I think you are doing a good job with your dog and you don’t need to worry about mine.”
"It smells mine!"
Laughing so hard I choked and walked to the kitchen for a glass of water. Thank you. This is pure not-a-dog-owner bliss.