Does your roommate provide most of his care? There's another thread here about a dog that is resource-guarding a chair. Humans can be resources too. Is it possible he is guarding a prized possession, ie your roommate?
If that's the case, I'd suggest that you take over feeding him, etc. Also, your roommate can correct him in this situation by taking him off the couch if he is aggressive towards you, or giving him a time out.
I think the treats idea is good too. |