It has only been a month since I had to put Genghas Kahn down. He was only 9 but had allergies so bad and the vets couldn't make him better. It is the hardest decision. It is true that you will know. There just came the day when I looked at him and realized that although he still asked to go to work with me he wasn't enjoying it. I do not regret it but I sure miss my baby. I wish the best for you. And your baby!