In August 2009, I noticed he was dragging his left rear paw. His vet suspected DM, but could not confirm without a few tests. After seeing a specialist, x-rays and an MRI, it was decided Scooby had DM. The tests had ruled out all other possibilities, DM was the only possible diagnosis. Before this, I had never heard of DM. When I began to understand the disease and the prognosis, I was devastated.