The reason why native dogs fight may be because they have this kind of nature, or they are caused by certain stimulation. Dogs are social animals, and there are various relationships between them, including competition and fighting. Fights between dogs are often to protect themselves or the entire group's status, territory or resources. Alternatively, fights between dogs can occur because they have a strong desire for something (such as food, a toy, or a companion) and are fighting to satisfy that desire.
Fights between dogs may also occur because they feel threatened or fearful and are trying to protect themselves by fighting. In some cases, fights between dogs can also result from them being improperly trained or cared for by their owners. For example, conflicts between dogs may occur if their owners distribute food or other resources among the dogs unfairly. In short, the reasons why dogs fight are varied and may be due to their own nature, external stimulation, or improper training or care. If your dog fights frequently, it is recommended that you seek help from your veterinarian or trainer to ensure your dog's health and safety.