A dog's hair loss will begin all over the body at the same time, but the hair loss on the back will be more obvious and severe. The hair loss in other parts of the body will not be obvious, so it is not easy to detect. The moulting period of dogs generally lasts for about three months. During the moulting period, you must pay attention to the dog's hygiene, bathe and deworm regularly to avoid skin diseases, and comb the dog's hair every day to promote blood circulation. .