Animator Avi Blyer has shared these with us, thanks Avi.
This is one of the best scenes of Pongo in the "101 Dalmatians". Pongo has just found out that he became a father of 15 puppies and Milt Kahl animated him kind of drunk as he walk towards Roger.
There's a story about this particular scene. Milt gave a lecture to a young group of animators and showed this scene as an example. He said that in order to animate a drunk dog you need to know how a real dog walks and all the mechanics involved, which is a very complex thing. As he started to analyze the walk, someone in the group shouted "I don't want to work that hard" and Milt exploded. He could not believe that an animator would say something like that.