People used to tell me that I would know when it was time for my 16 year old lovely girl to go, but I thought HOW will I know? She declined over a period of two weeks, but it was when she tried to join the other dogs in welcoming home my OH and her legs went from under her and I realised I did know. It was time. We gave her the best night and took her to the vet the next day. It's so hard, Puppy Sniffer, but if you feel you can, when the time comes, let your face be the last thing your dog sees as she goes to the Bridge. As someone has said previously, you will know in your heart.