This is true, it is often a misunderstood concept, too

The old dominance theories were flawed and have been disproven however some still live by them. However, there is no doubt that dogs live in a hierarchy, but it has little to do with the theories often told. Truly dominant dogs rarely, if ever, display these so called dominance displays. Many of the so called dominance behaviours are simply bad manners and the dog has learnt that it gets what it wants by do it.