1. Confirm the cause: Your dog may vomit and not eat for various reasons, including gastrointestinal infection, gastrointestinal problems, infectious diseases, parasites, foreign bodies, etc. In order to confirm the diagnosis, the dog should be taken to the animal hospital for examination.

2. Follow the doctor's advice: If your dog is still not getting better after treatment, I suggest you follow the guidance of the veterinarian, including the use of drugs and the adjustment of diet.

3. Diet adjustment: During the dog's illness, try to give him digestible food, such as porridge and canned food. At the same time, some probiotics can be added to help restore the gastrointestinal function of dogs.

4. Observe the condition: After the dog is treated, it is necessary to closely observe the development of the condition. If the condition continues to deteriorate, you need to return to the animal hospital for examination and treatment in time.

5. Pay attention to hygiene: in order to avoid the spread of infectious diseases, it is necessary to keep homes and pet shops clean, disinfect them regularly, and follow the guidance of animal hospitals.

I hope these suggestions will help you and your dog. If the problem still exists, please seek the help of a veterinarian in time.