Hello,
A couple of points some of you may be interested in;
Leaning can be a breed related trait. Great Danes, for instance, were bred as hunting dogs of large, bulky prey such as wild boar. These pigs were dangerous to hunt as they would often turn and fight. Great Danes, natural leaners were bred to intensify this trait and would bring down the boar by leaning against them at full speed.
Secondly some of you seem to think any mention of dominant behaviour means aggression, this most definitley is not the case. In very few cases is aggression linked with dominance. Very many of your dogs are however displaying dominance by leaning. It feels pleasant and yet the dog is getting reassurance on demand and preventing you from doing what you want to do, so who is controlling that situation? A dog that is showing dominance in this way may not be dominant in any other situation, but if any of you have dominance issues it may be food for thought