Freshman Blue Dogs in the House are sometimes nicknamed "Blue Pups".
A Blue Dog Democrat is a member of Congress who is moderate or more conservative in their voting record and political philosophy than other, more liberal, Democrats in the House and
Blue Dog Democrat
Blue Dog Democrats are also sometimes called "Reagan Democrats." They are conservative, rather than progressive, and have a tendency to align themselves with GOP policies in matters of taxation and spending.
The Blue Dog Democrats are standing in the way of true healthcare reform.
Senate. The Blue Dog Democrat, however, has become an increasingly rare breed in American politics as voters and elected officials become more partisan and polarized in their beliefs.
A Blue Dog Democrat is so-called because of the character Dino on the cartoon television show The Flintstones. Dino was a blue dog, and the letters DINO stand for "Democrat In Name Only."
https://www.thoughtco.com/blue-dog-democrat-3367817
https://www.urbandictionary.com/define.php?term=Blue%20Dog%20Democrat