I have a 12 year old lab named Harley. Other than arthritus, which he is on meds for, the vet says he's in great health. Recently, at night, once we are all in our rooms ready for bed, instead of going to sleep on his bed, he stands at the stairs and barks. Not the "There is someone outside" bark, but more of the "pay attention to me" bark. I have literally tried everything- taking him to my room, his kennel, giving him treats, laying with him, ignoring him, I don't know what else to do! It kills me to listen to him carry on, I just don't know what is wrong ...Please help if you have ANY advice at all it would be greatly appreciated!!!