Regardless, in this situation it 100% is necessary. This poor dog is going to ingest something he shouldn't and die really early if Roommate doesn't get his head out of his tuchus and learn what it means to be a responsible, ethical pet owner.
Unfortunately, given KW's comment about the dog being shoved outside and ignored all day for doing something wrong, I doubt that's going to happen. I know exactly what kind of owner this dog has, because we see them bringing their undertrained, unsocialized animals into our shelter and dumping them on us all the time-- and more often than not putting them down for major behavioral issues, too.