Alanon is a 12 Step program for friends and family of alcoholics andor addicts. I suggest Alanon, because even in Los Angeles there are many more Alanon meetings to fit anyone's schedule than Naranon meetings.
It is NOT your responsibility to have him come live with you. He is an adult. The social worker at the hospital is NOT part of Adult Protection Services. SW from APS evaluates the WHOLE situation, and there are 'Assisted Living Facilities' that DO allow pets.
I know he is your father, but sweetie, YOU CANNOT HELP HIM. It is better for him to deal with 'agencies' than for you to get involved. And remember, he may not want help. That is where Alanon comes in.
Yes, we are here for you and we are open 24/7.
Hang in there.
Love and hugs,