Groups of related diseases are often combined into one category, for medical classification purposes. That's the case with polyneuropathy - an umbrella term that describes a group of disorders which affect multiple nerves. These diseases can strike any combination of nerves, and may be either inherited or developed later in the dog's life (acquired).
Polyneuropathy affects the peripheral nerves. These nerves are found outside of the brain and spinal cord, which together comprise the central nervous system. The term "neuropathy" simply means that some part of the peripheral nervous system isn't functioning properly. [...]