Thank youMate, as a dog lover and owner for nearly 50 years I really feel for you. The best advice I ever got from a vet is if the animal is struggling to get out of bed and, for a dog, is not wagging its tail, then the kindest thing is to let them off. I have three dogs at the moment, 2 GSDs and a loveable 14 year old mutt. The mutt is defying all veterinary science.
Over the years I have had to make the hard decision for dogs and cats.
I really wish you well mate.