attack dog

In the House, West earned a reputation as a ferocious right-wing attack dog.

But he hurt himself with a chip-on-the-shoulder demeanor and attack-dog aggressiveness against Mitt Romney.

Gone was Gingrich the attack dog, replaced instead by Gingrich the enthusiastic, vigorously nodding wing man.

Think of them as a combination of a flying air-traffic-control center and a lethal attack dog.

Get ready for new Florida Senator Marco Rubio to be playing the role of GOP attack dog come summer of 2012.