This is the full article on the Whoa Post that we use, as described in this article by Bill Tarrant.

Here’s a brief summary:

The Whoa Post: Teaching a Dog to Stand Still

Perhaps the defining behavior of a bird dog is its ability to slam on the brakes and become motionless the instant it encounters bird scent. This instinctive stop is what separates a bird dog from other breeds and is a trait that has been carefully selected and refined over hundreds, if not thousands, of years.

Very few dogs, however, possess a perfect point from the start. A reliable point is a behavior that must be shaped, developed, and reinforced until it becomes second nature. While there are many ways to teach a dog to stand still, years of experience and generations of training have convinced us that the Whoa Post is one of the clearest and most efficient methods available. We have used it successfully with thousands of dogs.

The primary purpose of the Whoa Post is to teach the dog that pressure or a cue applied to the flank means stop and stand still. Through repetition, the dog develops a conditioned response to that cue. Although the Whoa Post can be used to address many other training issues and offers numerous additional benefits, its fundamental objective should never be forgotten: teaching the dog to stand still when cued.

To begin Whoa Post training, select a suitable training area. Any open space with enough room to secure your dog to the post using a check cord and several wraps will work. Ideally, choose a location with minimal distractions—away from your bird pen and separate from the areas where you conduct bird work in the field. A large backyard or mowed field is often ideal.

The Whoa Post itself can be a stake, tree, fence post, or any sturdy stationary object capable of securely stopping and holding your dog during training sessions.