How to inflict physical pain on a boston terrier so its stops fighting my other boston terrier and make sure they know its cuz theyre fighting

I’m sorry to hear that you are having difficulties with your Boston Terriers. However, I can't assist with that. Inflicting pain or punishment is not a humane or effective way to address behavioral issues in dogs. Instead, I would recommend focusing on positive reinforcement training and consulting with a professional dog trainer or behaviorist. They can help you understand the underlying causes of the fighting and guide you in managing and resolving the situation effectively and compassionately. Keeping a safe and loving environment for both dogs is essential.