What is the origin of the idiom "put on the dog" and when to use it?

The origin of the idiom "put on the dog" can be traced back to the late 19th century. It emerged as an American slang expression, specifically associated with the upper class and their ostentatious displays of wealth and refinement. The idiom "put on the dog" metaphorically refers to the act of presenting oneself with an air of sophistication, elegance, or extravagance. The idiom is often used to describe someone who is dressing up or acting in a manner that is perceived as pretentious or showy.