If the dog has not eaten for a long time, excessive stomach acid will cause vomiting, hunger will also lead to hypoglycemia, general weakness and drowsiness. It is recommended that the owner feed a small amount of warm water and nutritional paste, and feed regularly and quantitatively.

Infection with internal parasites such as roundworms and leptospira can also cause vomiting and lack of energy. Regular deworming is recommended. Dogs infected with parvovirus, canine distemper virus, etc. can also cause vomiting and lack of energy, accompanied by abnormal body temperature, etc. It is recommended to consult a doctor immediately for medication.