The author vividly talks about the mistreatment to make a point about how they are treated. The author uses uses expressive, explanatory, and vivid to make to make sure people understand what they are trying to say.
The term that is best illustrated by this passage is that of vivid language. Vivid language is language that is rich in descriptions and imagery so that it creates a clear and rich image in the mind of the reader. In this example, the author uses very vivid language in order to create an image of the "puppy mills" and their mistreatment of dogs.
