I don’t know what to do. Have a horribly behaved basset hound living with my boyfriend and I.

I’ve tried everything. I’ve studied, done positive reinforcement, let him free roam around the house and I feel like my day is constantly ruined by this dog. It is not my dog and I should have no responsibility over this dog truthfully, but I care too much to watch this dog continue this behavior. He SCREAMS at the door as soon as you let him out, barks constantly, has lunged at me in the kennel at times, pees and poops to the point it soaks into the tv stand, wakes me up in the middle of the night whining despite letting him out on a schedule. This is a dog we took in to help out a family member, but it is truly becoming a nightmare. I LOVE dogs and I am getting to the point I truly cannot stand it! Please, any advice would help.