The earlier you get your dog to the vet, the greater the odds of survival. Unfortunately, many dog owners fail to recognize the symptoms or wait too long to see a vet; when they finally take action, their dogs are in the late stages of the disease and tend to die from dehydration. To diagnose parvo, your veterinarian may perform the Enzyme Linked ImmunoSorbent Assay (ELISA) test. This test checks your dog’s stool for evidence of parvo. It can be done in your veterinarian’s office.  The ELISA test gives rapid results, but it may not be completely accurate. Be aware that false negative results do occur. On the other hand, a test to confirm parvo may not really be necessary. The parvo virus causes severe illness. Since the condition is managed with supportive care rather than cured, it is not always necessary to run diagnostic tests. The treatment will likely be the same with or without a definite diagnosis. Proving it beyond doubt would not change the treatment given and could divert limited financial resources away from vital treatment. The ELISA test alone can sometimes fail to diagnose parvo. Your veterinarian may also perform a Hemagglutination Test, a blood count, and/or a direct fecal smear. The results of these tests, together with the ELISA test, will reveal the presence of parvo in your dog. There is no cure for the parvo virus; however, your veterinarian can recommend supportive therapies and practical measures that will increase your dog’s odds of survival. These might include:  Hospitalization Anti-vomiting medication Intravenous fluids Probiotics Vitamin therapy

TL;DR in Vietnamese:
Đưa chó của bạn đến bác sĩ thú y ngay lập tức. Yêu cầu kiểm tra ELISA-Kháng nguyên. Thực hiện thêm một số phương pháp kiểm tra khác. Làm theo chỉ dẫn của bác sĩ thú y để điều trị sao cho hợp lý.