Bill Hillmann describes how to retrain an older dog to SIT. The complete process is shown in the DVD called "Traffic Cop," available at http://www.hawkeyemedia.net If you like this clip give it a thumbs up : ) What about dogs that are 3, 4, or 5 yrs old that really have never been taught to SIT. They've been corrected for not sitting a lot. They are sitting only momentarily, with their butt up off of the ground and they are not sitting well with major distractions, like a shot flyer or a kitten running across in front of them. Bill says you can change that but it takes a lot of work. He demonstrates how to get the dog excited, then you make him SIT, then you begin reinforcing the SIT command with the remote trainer with a very low number. He demonstrates how to carry this out reinforcing a command they already know.