Oh WOW!! I really am sorry!!
It is just different with Great Pyrs>>>>I feel in love with the breed when I first saw them and they have been EVERYTHING I hoped for and MORE!! They are such intelligent and kind creatures, so full of protectiveness and caring for others.
I know how very hard this is for you. I am sorry. It is the difficulty when we love something so much and it loves us in return, to have to say goodbye before we are ready.
If you have determined this is the step you must take then I pray you find the courage and wisdom not to allow your best friend to suffer..... remember her for the joy she had in life, for the mischief in her eyes, for the comfort she gave you and the love that she returned a thousand fold......she will not forget you.
Prayers for both you and Noel>>>>>