It is normal for a dog to have scrotal congestion, redness and swelling after sterilization. It will generally recover slowly three days after surgery. If it does not recover within a week, it may be due to wound inflammation and infection. It is best to send it to the hospital for examination to avoid delaying wound healing. . Just pay attention to keeping the wound hygienic, but do not bathe the dog and do not let the dog lick it to avoid infection. It is best to wear an Elizabethan collar.