Dog walk cycle: Step by Step

"This is my first tutorial for a quadruped since for a lot of new animators can be quite complicated I try to break it down in 2 different walk cycle.
So maybe in this way can be easier to understand: for the back leg I animate first the major key and then in a second moment I animate the hip, for the front leg I animate the hip first and then I animate the leg individually.
Then, later on, I refine the cycle a bit. Hope you guys can learn something from it"