While playing the K9 Nose Work® game, your dog crosses the invisible line of odor and does an immediate head snap toward the hidden odor. She then moves her head (and nose!) back and forth until her nose comes in contact with the hidden source of odor. You have placed the hide, so you know exactly where it is located. Do you jump in quickly while her nose is still at source or do you wait until she "tells" you where the hide is? I like to pay both behaviors and I encourage my students to do the same.