I am deeply sorry to hear of about your Dog. Anyone that has lost a pet in the past or has been where you are now, on the threshold of losing him to cancer, can sympathise with you. I've been there hun and its ing tough, in every way imaginable, all I can say is even in this dire situation where every moment you spend with your pet is precious, look not on with sadness, but try and remember those wonderful times that you spent together. 13 years is a remarkable age for any dog to live and if your dog to speak back to you I'm certain he'd thank you for been part of his life and let's just hope that his departure from this world is a painless one. I hope that does'nt sound harsh - but we can't turn back time and at this moment in time our thoughts are with you and your pet dog....