I'm so sorry, Ken. You're going to go through a lot of the stages of grief for a while. Lean on us. And it's ok to be angry at addiction, I know I am.
I know this isn't something that you need to deal with right now but this is what I did in a former life - I was an estate planning attorney. When you are thinking about your planning, leave your belongings to anyone or any charity you like, but don't forget to provide for Max and Jezz (and any future pets)-- so many people forget their pets. The best way is to create a small trust for their care - that way you know they will be taken care of in the way you'd like them to be. And make sure to name their guardian.