My pig's latest thing is to 'beg' by standing upright, he'll go nearly vertical and stay like that for several seconds, often accompanied by chirping (wheek wheek wheek). He'll repeat this until he gets a carrot, which he can only have once per day. Also he seems to climb up the side of his cage a lot, his back legs never leave the ground but again he stands vertical and holds himself there with his front paws. Anything to be concerned about?