Slick, I'm so sorry to hear this, I know how it breaks your heart to see Max like this. It's such a shame that the Sub-Q fluids didn't work out, I wish he would start drinking more. The way he sits and stare at nothing does indicate that he is going a bit senile. Fister will that sometimes too. Is he meowing more, also?

I hope the vet can come up with some treatment that will help him!

Fister and I are sending lots of purrs and positive thoughts to Max and big hugs to you!