It means that your dog is ill and needs an immediate attention. Take it to vet and get its complete examination done. Sometimes ignoring minor fever or other sickness can lead to serious incurable problems.
Your dog is shivering because it is feeling cold out of fever. Fever also makes dogs lethargic and exhaust that is due to weakness, an ultimate effect of fever. Take a close look if your dog has running warm nose as well. Fever is basically a reaction of an infection. Keep it warm and provide it with light easily digestible food in order to keep it digestive system functioning properly till it regains its health.
Your dog is shivering because it is feeling cold out of fever. Fever also makes dogs lethargic and exhaust that is due to weakness, an ultimate effect of fever. Take a close look if your dog has running warm nose as well. Fever is basically a reaction of an infection. Keep it warm and provide it with light easily digestible food in order to keep it digestive system functioning properly till it regains its health.