re: When should you put your dog down?

My vet says your dog will tell you and you will know. I can attest to this with our GRetreiver who did have a terminal condition. We took her to the vet and he felt like he had stabilized her for a while longer. We brought her home and she crashed. As much as we wanted her for some time longer we knew we had to let her go. And we cried. And we let her go the next morning.