The phrase "more mad dog" may have negative connotations, as it suggests an increase in aggressiveness and unpredictability. However, alternative synonyms can convey the same intensity in a more positive light. For example, "fierce" invokes a sense of brave determination and strength. "Intense" suggests a high level of concentration and passion. "Wild" implies a sense of freedom and uninhibited energy. "Untamed" connotes a natural and unhindered state. It's important to consider the context in which these phrases are used, as they can range from playful banter to dangerous situations. Ultimately, choosing the right synonym can make all the difference in effectively conveying the intended meaning.