There is also a type of injectable glucosamine that can help quite a bit, and it is relatively expensive, but as far as I know,
side effects are not an issue
in most cases. The bottom line
in this situation, as you are aware, is that 14 is very old for a golden retriever, and so she probably does not have a tremendous amount of time left, no matter what you do.
It is a very painful, difficult situation that you are in, and I'm sorry.