Rufus man gutted for you! My boyhood dag (Sam) was a border collie and a lovely ol boy he was too!
After I'd moved out I used to visit mum n dad with the kids on a Sunday and when he got ill at the end they swear he hung on until Sunday evening before he passed and he'd seen us one more time and I'm welling up just writing this.
I'll bet she had a lovely life and hopefully you'll find some comfort in that!
Take care man!!