Have the food treat in an easily accessible location so that it can be delivered to the dog within three seconds and while the desired behavior is still occurring. I use a cotton waist apron, available from most hardware stores and online for under ten dollars. A treat pouch or bag is better than a pocket, but it can take some time to get used to accessing the treat quickly. After some training for both you and the dog, you can transition to a pocket in your clothes, but for most of us, getting into the pocket for the treat and then delivering it to the dog in three seconds is still a challenge. Remember, timing is everything!
Photo by Andrea Arden, Flickr