You do realize that Rosy and her five daughters are well known dog trainers. Anyway, Rosy has a technique that is a bit different. Using a good supply of lubricant rub the head of the dog across the palm of the other hand. As you rub, vary the speed. With all of the nerve endings at the head of the penis, this can provide a sensational climax. For variety you can do the Rosy for a while and then switch to a different technique. Just do whatever gives you the sensation that you are looking for.