But it's tough to go in for a person to change their drinking habit if that's what they want to do. They are suffering from alcohol withdrawal syndrome and that causes people to shake sometimes. Something that I offered to my substance users is AA. They have a lot of resources and a lot of information on how to help. There are also state holiness to help with keeping sober and "recovery centers" in major areas that can assist with this.
Like I said, the most difficult part is them, the individual wanting to see a change. We unfortunatly, have a lot of people that cope with issues, mental or not with substances because it is easier.
Vet centers are a great resource as well, but getting people to use them is tough. You can lead a horse to water, but you can't force him to drink it.
Positive thinking and empowerment usually are starting points, you sound like you have a therapeutic relationship with him. Try to find some hobbies or interests and get some motivation from seeing what he enjoys. This may be beneficial or it may not be.
Good luck, this is not an easy task my friend
-m8