[GraceAAA]

Yes, there are lots of possibilities that can manifest symptoms such as you are describing. Without further diagnostics (starting with X-ray's) it will be nearly impossible for anyone to treat.

Degenerative myelopathy (DM usually seen in GSD) can occur in Rotties, as well as fibrocartilagenous emboli (FCE), cauda equine syndrome, spinal tumors, lumbar stenosis, lower motor neuron (LMN) disease, intervertebral disk disease (IVD) as well as nerve damage (sometimes even temporary)from injury...you can drive yourself absolutely crazy researching these possibilities online but it would probably be best following up on the x-rays and then proceding to other diagnositics (MRI, etc.) if neccessary.

We have a girl (nott-weiler) with a spinal cord injury...her injury was at both the cervical and lumbosacral levels but thankfully, with acupuncture, homeopathics and hydrotherapy she is fantastically functional having lost deep pain, gross motor and bowl/bladder control after her injury and now regained.
Best wishes