Noun
Used other than figuratively or idiomatically: see yellow, dog.
(US, especially Southern US) A Carolina dog.
(US, informal) An item or person of low value.
(US politics, uncommon) Short for Yellow Dog Democrat.
Yellow Dog (plural Yellow Dogs)
Alternative letter-case form of yellow dog, chiefly used when the word has the sense "Carolina dog" or the sense "Yellow Dog Democrat".
yellow-dog
These injunctions were often extremely broad; one injunction issued by a federal court in the 1920s effectively barred the United Mine Workers of America from talking to workers who had signed yellow dog contracts with their employers. Source: Internet
Today the term refers to a hard-core Democrat, supposedly referring to a person who would vote for a "yellow dog" before voting for a Republican. Source: Internet
It looks like small yellow dog with a bright red collar. Source: Internet
Politics is something that is never going to go away and whether you are a yellow dog Democrat or an ultra right wing conservative, because it is the United States, you have your right to your opinions. Source: Internet