Recommended Tests to help rule out other conditions:
A full Neurological examination
DM DNA test;
DM DNA test;
Blood tests, to include Lyme disease testing;
MRI, and CSF analysis
At this time DM sadly cannot be a 'confirmed diagnosis' in a living dog, but many other conditions can have the same or similar symptoms and some of these other conditions can be treated successfully, or require different therapy to a dog with DM, to avoid further damage. It is therefore recommended if at all possible, taking into consideration your own personal and dogs circumstances, to pursue as much testing as you can to 'Rule in or out' these other diseases and conditions.
Just some of the other Diseases and Conditions
Peripheral nerve disease, Lumbral Sacral Stenosis, IVDD, "Discospondylitis, Spondylosis, Tick Diseases, Thyroid Problems, Cushings Disease, Wobblers, Polyradiculoneuropathy, Polymyositis, Granulomatous Meningoencephalomyelitis (GME) and spinal tumors are just a few diseases that can initially present similarly to DM. Below are more details of just a few conditions that are often mistaken for DM. One important rule to remember is if signs appear suddenly that you think are DM, then it is almost not DM. DM is a gradual onset, progressive disease.