my dog has been acting weird this past week. He sits at the bottom of the stairs and whines. He's trying to climb them and he's done it thousands of times before, but for some reason he's not and he just sits there and whines. And its getting to be quite annoying. He's not injured to my knowledge. He's up there in age though (if that might have anything to do with it) anyone have an opinion or idea of what is going on here, i don't want my pup to be whining in the middle of the night, my parents are redoing their bedroom so they moved everything in their room downstairs and are currently sleeping down there so he will sometimes switch from upstairs to downstairs during the night. anyways if you could help that'd be super