Your dog is shaking or shivering which can be due to many reasons. Among major reasons of shaking, pain is very important. This pain can be due to
1. Muscular and skeletal problems
2. Disc injury
3. Traumatic injury
4. Damage and inflammation of the tissues
5. Exposure to heat and cold
6. Some other disease
7. Nervousness
8. Skin parasites
Loss of appetite is a general sign of illness. So, it will be better to take your dog to vet for proper diagnosis and treatment.
1. Muscular and skeletal problems
2. Disc injury
3. Traumatic injury
4. Damage and inflammation of the tissues
5. Exposure to heat and cold
6. Some other disease
7. Nervousness
8. Skin parasites
Loss of appetite is a general sign of illness. So, it will be better to take your dog to vet for proper diagnosis and treatment.