Whether a dog can be vaccinated when it has diarrhea mainly depends on the specific health condition of the dog. Generally speaking, if the dog only has mild diarrhea, is in good spirits, and has no significant decrease in appetite, vaccination may still be possible under the guidance of a doctor. However, if the dog's diarrhea is severe or accompanied by other serious symptoms, such as high fever, vomiting, loss of appetite, etc., then doctors usually recommend delaying vaccination until the dog's health condition improves.

This is because when a dog has diarrhea, its body may be in a state of inflammatory response, and vaccination Afterwards, the body will produce a similar inflammatory response. If the vaccine is given when the dog already has an inflammatory response, it may cause additional stress on the dog's health. In addition, when a dog is in poor physical condition, its immune system may also be less responsive, which will affect the effectiveness of the vaccine.