So here we are. We have confirmed lymphoma and we know the average life expectancy for a patient with untreated lymphoma is about 2 months from the time of diagnosis. If this is your dog you probably need some time to absorb the import of the cancer diagnosis. You have many general questions and you know that a decision regarding chemotherapy must be rendered. There are important genetic factors as well.
Cancer starts with one or a small group of cells that have gone wrong.
Sometimes these cancer cells escape our natural mechanisms and cancer develops. It is important to realize that cancer is not contagious and that, as a pet owner, you should not feel that you caused this or brought it on your pet somehow. This is a natural part of grieving but it is important not to focus on cause unduly. It is best to concentrate on treatment. At this time, there is no way to know what caused lymphoma development in a given patient.