My heart felt sympathies struggling with this. I smiled when you ended with "I wan a CLEAR answer!" I know I felt that way too, each time this situation arose. And deep down, we know that if there were a CLEAR answer, well, threads like this wouldn't get started!

Be sure to ask the vet lots of questions, get the medical side of the situation. What are the possibilities, probabilities. You need input from all angles to help make a decision to go on or not to go on.

Seeing Taz playing this morning, aw, now THAT brought tears to MY eyes!