Update On Scared Cat
Thanks for the suggestions. Murphy has been with us for about 3 weeks now, and he's adjusting. Guess I was too impatient.
I don't think he was ready to explore the entire house at first; so I put him back into my office for a while. He was SO happy to get back that he rolled all over the floor, jumped on the desk and rubbed on me and purred & purred & purred.
Then after about a week, I opened the door from my office into our living area downstairs. He started to explore. The door to the upstairs was closed; so he didn't interact with other cats -- just the dog. The dog thinks Murphy is the best thing he's ever seen. Murphy let's him know when he's had enough. Max is over exhubert -- follows Murphy everywhere & sometimes Murphy will rub against the dog's legs.
He was still hiding after a few days of downstairs living area freedom -- would explore when he was alone. When I would come downstairs, I would have to coax him out, and once I did that, he would be okay. Stopped coaxing & now he's coming out by himself. The door to the upstairs has been opened & there's been some hissing from the other cats (but not excessive) who are coming back downstairs, but Murphy just sits and looks at them.
Next step is his getting brave enough to venture upstairs on his own, and he'll do that when he's ready.
He is such a lover, and I'm really getting attached to him. Am very pleased with the progress & just had to tell everyone. He's going to be a great addition to the family.
Thanks again, everyone.