For some people, such names are a way of achieving ego reduction, entering bottom space, or getting over sexual inhibitions.
A classic technique to put a submissive into bottom space is to combine humiliation with pleasurable physical sensation, including sexual stimulation.
Humiliation may be reinforced by being in public or in front of other people.
This may include being made to go out in very scanty or revealing clothing or cross-dressed.
For example, one bottom who plays the part of a dog may enjoy being mock-forced into it and the top will emphasize the lowness of the bottom’s status as an animal.