We highly suggest that you only euthanize your paralyzed dog when there are no other options, they are in a significant amount of pain, and their quality of life has deteriorated to a point where they can longer live adequately.
The most common causes for paralysis or paresis include intervertebral disc disease and rupture, fibrocartilaginous embolism, or FCE, injury, trauma, congenital defects, or a space-occupying lesion such as a tumor along the spinal cord.
While these conditions are not exclusive, they all have one thing in common: compromise or damage to the spinal cord. The spinal cord is a very vital structure made up of nerve fibers that serve as a “highway” for impulses and signals originating from the brain down into the body and limbs.