This is part of the reason I'm getting a labradoodle from Tink.  I needed a plan to keep busy since I won't have any kids around.  I am going to train a therapy dog.  Ever since my brother had a stroke 3 years ago and I watched the rehab center using therapy dogs, I knew that was what I would do someday.  I will be a part of this group 
www.therapet.org  It's about an hour from where I live, but that's fine.  Tink is picking a puppy for me, and Mike and I are driving to Wisconsin to pick it up.  We needed something to look forward to, and this is doing the trick.
I'm excited to get a dog.  Even if for some reason it can't become a therapy dog, I'll have a great pet.  Mike's great dane is getting old...