Well I'm back. I volunteer for Big Brothers Big Sisters, and my "little", who is 6 and is Kindergarten was in a play at school. I went to see her and we came over to play a little. She immediately asked about Theodore (I told her last week that he was sick and that I would likely have to take him to the vet to be euthanized). In her wise way she said something like, "yes, they eventually wear out, sort of like batteries". So I told her on the way over that I took Theodore this morning, and that he wasn't suffering any more.
While she was here she said she missed him, as she typically runs to find him the minute she gets here. I bought a toy carrot that you open & put catnip into, a few months ago, but Theo had quit playing with toys long ago. My "little" asked if she could keep Theodore's collar, and I told her "No", but gave her his carrot toy to play with her one year old cat with.
Anyway, we will adopt two cats in the future. Maybe in Autumn or in Winter. Time to remember and to grieve.
Thank you all.