If a three-month-old dog eats intolerant foods such as milk, or eats expired and spoiled food, it will cause diarrhea. It is recommended to feed an appropriate amount of probiotics to regulate the gastrointestinal environment.

Three-month-old dogs infected with parasites such as roundworms and coccidia can also cause vomiting. It is recommended to deworm the body immediately.

Three-month-old dogs are very susceptible to coronavirus and parvovirus, which can also cause vomiting, depression, abnormal body temperature, etc. It is recommended to consult a doctor for medication.