If the puppy has not been vaccinated, it is most likely caused by infectious diseases such as parvovirus. The most obvious symptom is soy sauce or ketchup-like stool, accompanied by a bloody smell and a foul smell.

If the diet is irregular, it may be due to food irritation. It is recommended to feed low-irritation food and adopt a feeding method of small meals and frequent meals. It is recommended to consult a pet doctor in time.