My mixed breed who is somewhere between 13 and 15 had a mammary tumor that was malignant removed less than a year ago. I took her to the vet this morning because her back legs started giving out on her. He took x-rays and not only did the mammary tumors come back, but it has spread to her chest/lungs. I had a feeling she still had cancer, but to see that x-ray image of the cancer in her chest, I lost it. I asked him what the absolute maximum time I have left with her is and he replied that she would be lucky to have six months. Please say a prayer for her that she is not and will not suffer and please say one for me- pray for me that I will have the strength to know when it is the right time for her to pass and that I won't be selfish.