What color dog are you?

yellow dog / adjective

1 : mean, contemptible

2 : of or relating to opposition to trade unionism or a labor union

Merriam-Webster informs:

In the 19th century, the noun "yellow dog" developed a derogatory sense, meaning a low, despicable person. This usage probably came about from the traditional association of the color yellow with cowardice. Just before the turn of the century, "yellow-dog" started to be used by writers who were derogatorily describing organizations that expressed opposition to trade unions. The popularized term "yellow-dog contract" referred to an agreement made by an employer and employee in which the employee agrees not to join a labor union during the time he or she is employed. While such contracts proliferated in the 1920s, they were later made unenforceable in U.S. federal courts under the Norris-LaGuardia Act (1932).

blue dog / adjective

The Democratic Blue Dog Coalition is a group of currently 54 conservative Democratic Party members of the U.S. House of Representatives, first formed in 1995. The Blue Dog Coalition describes itself as a group of moderate-to-conservative Democrats committed to financial and national security.

Wikipedia informs:

"Blue Dog Democrat" is derived from the term "Yellow Dog Democrat." Former Texas Democrat Rep. Pete Geren is credited for coining the term, explaining that the members had been "choked blue" by "extreme" Democrats from the left. The term is also a reference to the "Blue Dog" paintings of Cajun artist George Rodrigue of Lafayette, Louisiana; the original members of the coalition would regularly meet in the offices of Louisiana representatives Billy Tauzin and Jimmy Hayes, both of whom had Rodrigue's paintings on their walls. Tauzin and Hayes later switched to the Republican Party. An additional explanation for the term: "A blue dog is our mascot because when dogs are not let into the house, they stay outside in the cold and turn blue," a reference to moderate and conservative Democrats feeling left out of the Party which they believed had shifted to the political left.