This dream is rich in imagery and symbolism, and it seems to reflect various aspects of your life and emotions. Let's break it down into key elements:

1. Underground Tunnel: Tunnels often symbolize transitions or journeys into the subconscious. The fact that you are walking through one may suggest you are exploring deeper feelings or unresolved issues in your life.
2. The Black Chrysler 300: Cars in dreams often represent control and direction in life. The color black can symbolize power and elegance, but also can have associations with the unknown or hidden aspects of oneself. The car's sliding to the right might indicate feelings of losing control or being pulled off your intended path.
3. The White Pug: This dog could symbolize vulnerability and the need for compassion. Its condition (street life, injuries) might represent feelings of neglect or the struggle for survival, possibly reflecting someone or something in your life that needs attention or care. Your decision to walk past the dog could suggest feelings of helplessness or fear of engaging with difficult situations.
4. The Cheese: Cheese, especially when associated with cleanliness (as it was on plastic), can symbolize nourishment and comfort. The pug's rejection of the cheese might suggest a deeper awareness of something that seems appealing but may not be safe or beneficial, perhaps pointing to a situation or choice in your waking life.
5. Driving and the Young Girl: The act of driving with your friend and the focus on the young girl at the science camp suggests a sense of responsibility and guidance. The girl’s intelligence and ability to outsmart older students may reflect your aspirations or feelings about nurturing potential, either in yourself or others.
6. The Science Camp and Dark Walls: This setting symbolizes growth and learning but also suggests exploring the unknown (the dark walls resembling a cave or tree). The camp's unique structure indicates a deep immersion in knowledge and a journey towards understanding.

Overall, your dream seems to reflect themes of exploration, responsibility, compassion, and navigating challenges. It may be calling you to pay attention to areas in your life where you feel the need for control, where compassion is required, or where you are nurturing potential—both in yourself and in others. The consistent return to the dog and the act of helping it with cheese could symbolize a need to address neglected aspects of your life or to take action where you previously felt powerless. Consider what these symbols mean to you personally, and how they relate to your current life situation.