Upon reaching the field, the handler often will "cast" or direct the dog in a wide circle. Experienced dogs will search the edges of the field knowing that birds are usually found there. This wide run helps to burn off the dog's initial exuberance and may help the dog establish its bearings and form a "background" upon which game smells will be processed. The dog then begins working back and forth, starting near the hunter and slowly ranging out. The dog repeats this process as the hunters move through the field. How far a handler allows the dog to range is a matter of personal preference. When a pair of dogs work as a team, one works close in while the other ranges out in larger circles. If either dog becomes birdy, the other dog works its way over to assist. Good bird dogs are alert to their handlers and to the disposition of other dogs in the field. They should readily comply if the handler casts them to an area of particular interest, such as a brush pile or shuck of corn.