Vader had grown up in a harsh environment. Sand, sand, and sand. He had loved his mother with all his heart, and had grown up around other lions. He knew what Lion's were suppose to act. But his childhood had also been a constant fight for survival- could you blame him? Traits that had carried from his childhood and now they got mad at him for it.
Vader laid down on his porch, his arms sticking out of the railing, his face somewhat obscured by the rails. As if he was caged off and separated from the rest of them, and his paws symbolized him trying to get out. Perhaps out of this life, or out of this body. Oh, he didn't know. But he was increasingly more and more bothered by the fifteen foot coffin in his room, where his true form was hibernating.
He was bored, too.