(verb) To engage in the relentless pursuit of an objective or goal, often involving the accomplishment of tasks through other, less expedient people. This includes obsessive follow-up, nagging, and harrassment of individuals holding up the accomplishment of the goal. Comes from a reference to pointer dog breeds that serve as loyal hunting dogs, leading the way to the fallen fowl.
"I had to bird-dog Larry all day to get him to sign that damn contract."
He said: "I'm so frustrated. I called two days ago, and still...no response from customer service."
She replied: "Oh yeah, you have to bird-dog those guys daily to get anything done. They're totally swamped."