thats cr@p, no dog should be treated like that. I'd be straight with my friend and tell him to talk to his brother either about putting it up for adoption, letting me (you) have it, take care of it properly (feed, water, bathe, walk, and get out of pen) or you will call animal cruelty on him. Just make sure to have your friend tell his bro that you are worried and if he gives you a hard time, report him. Your friend shouldn't mind since you said he's on your side. BTW, why doesn't your friend feed and walk the dog?
Layin' the Hammer down, one gritter at a time.