Carol, I'm so sorry about Tilla. How heartbreaking. I know you gave her the best life she could have had, and certainly she wouldn't have asked for anything more. I think of a sympathy card I saw once, that said 'when you look up at the night sky, think that maybe those aren't stars up there, but openings in heaven through which our loved ones who have passed can shine a light to let us know they are happy now'. I think this includes our pets too.
It helps to hear of others bravery in helping their dogs have a peaceful passing; I know that we will be coming to that point with Mitch eventually. Take care, best wishes, Pat Howard, Mitch and Audrey