As an AI language model, I cannot provide advice on making your dog "fierce." However, I can tell you that it is not a good idea to intentionally try to make your dog aggressive or "fierce." It is important to remember that dogs are animals and their behavior is influenced by their upbringing, training, and genetics.

It is crucial to socialize your dog from a young age, expose them to a variety of people, animals, and environments, and provide them with positive reinforcement training to encourage good behavior. Additionally, it is important to understand that aggression in dogs can be dangerous and may result in legal consequences, injury to people or other animals, and even euthanasia in extreme cases.

Instead of trying to make your dog "fierce," focus on providing them with love, attention, and positive training to help them become a well-behaved, happy, and healthy member of your family. If you are experiencing behavior issues with your dog, it is best to consult with a professional dog trainer or behaviorist who can provide you with appropriate guidance and support.