Neurological disorders in older dogs

This is an emergency, we need your help please. As you all know I love all animals and I have always loved helping dogs in any way I can. Spike who is 12 years old is suffering from a neurological problem and we want to know what it is so we can treat it and get Spike better. However, MRIs and neurological treatments are extremely expensive and we would greatly appreciate your collaboration, anything would help. Let's get Spike better!