Wow, I really love that dream, OMJ. I know Jack was an excellent friend to you. Thanks for sharing it. I think that when you dream so vividly of a loved one that has died, it is a true experience with that person. I think he probably was reassuring you. I had several realistic, reassuring dreams of my mom after she died. Here is one I had on her birthday 08 Feb 08):

I dreamed that I was spending a lovely full day with my mom. We went somewhere to eat and we saw a group of people that knew her. They looked shocked because they knew she had died. I told them I was being granted one last day with Mom to enjoy and appreciate the time with her.

I also think it is interesting the pet dog name connection with Jack. As to me, dog spirits are akin to people spirits. They are very connected.