Neighbors Dog

My new neighbors that live upstairs leave their dog in a kennel for hours at a time. He howls and cries all day and late at night. I’ve talked to my landlord once. I really don’t want to complain again when it comes to another persons animal.. but I’m not sure what else to do. It sounds like he has separation anxiety and hates his being in the kennel. But even when my neighbors are home it sounds like they aren’t doing anything to try to make him stop howling and crying.. ugh