How is sweet Gus doing? I'm sending so many prayers your way as I know how tough this is going to be. I learned that Catfish's osteosarcoma is really aggressive and they don't actually recommend a second chemo treatment. I'm in a similar place as you in that now I just have to wait until he lets me know he's in too much pain.
Give Gus a big ol' hug and kiss from me and Catfish and let him know that we're both thinking of him.
God bless -
Jessica