It is generally normal for dogs to have menstruation for 30 days and still have blood. Due to individual differences, dogs usually have menstruation for about 15-30 days, and many dogs only have menstruation for 7-15 days. If the dog is in good spirits and does not have symptoms such as fever, loss of appetite, vomiting or diarrhea, there is generally no need to worry too much. You can continue to observe it for a few days and pay attention to keeping the dog's vaginal opening dry and hygienic to avoid the breeding of bacteria. However, if your dog’s menstrual blood becomes more and more abundant, and there is an obvious odor, and the dog’s mental state and appetite are also abnormal, there may be a problem with the reproductive system. It is recommended to take the dog to the pet hospital for examination in time.

Things to note during the dog’s menstrual period:

1. Keep the puppy warm and do not let the dog catch cold, especially in winter.

2. Dogs have a long menstrual period and need to supplement nutrition, especially blood-replenishing foods.

3. Pay attention to the cleanliness of the dog to avoid infection of the reproductive system. You can clean it with water every day.

4. Try to avoid strenuous exercise and do not feed your dog irritating food.