Does dog mean m?

No, m refers to people with dog attributes.

The "dog" in SM circle refers not to a real dog, but to a person who shows the characteristics of a dog.

Master-dog relationship and master-slave relationship are not the same thing, and there are some subtle differences between them (according to statistics, master-slave relationship is just a general term in SM activities, which can be divided into different categories, such as master-slave, master dog, master pig and so on. This will be discussed later).