Periodically, lay your hand, leg, foot, or arm over his back when he is lying down, sitting, or standing calmly. Leaning can be another form of dominant behavior among wolves and dogs. Once you have progressed this far, from time to time stand over your dog, wrap your arms around his belly and lift his front end up toward you. When he responds without struggle, praise him calmly by telling him he's a good dog. Perhaps you have a female who marks territory.
Some females even lift their leg much as a male does.
However, it is more common for a dominant female to lift her leg off the ground under her body. Since this is not as readily noticed, most owners miss this signal of dominant behavior in their female dogs. Our position is that urinating and spritzing is acceptable to a degree. During the walk, allow the dog to mark occasionally. You can do this by body language, sounds, and voice tones, or you can use a morsel of food.