Here's what might be causing the confusion:
* "Stop" as a command: You might be thinking about the command "stop" used in dog training. This means to cease an action, like barking or running.
* "Stop" in a physical sense: Dogs have a stop in their facial structure, referring to the slight indentation between the eyes and the muzzle. This is a breed characteristic, not a physical "stop" like a human's.
If you can clarify your question, I can give you a more precise answer!