Hi. About a month ago my 13 yr old terrier mixed breed dog began losing control of his back legs. He also sways somewhat when just standing and acts somewhat confused. After eating a raw diet for over half his life he will now only eat boiled chicken and an occasional carrot. The onset of these symptoms was about 1-2 weeks after getting a rabies booster and 1 dose of Heartgard that I was talked into after moving to a more rural area in CT, he hasn't been on this or tick meds in years. I do not know if these symptoms are caused by the vaccine and meds but I figured I would be brushed off at the conventional vet and wanted another opinion on what to do. If this is connected are there options for testing/healing, or should he be tested for something completely different?