Your dream is rich with symbolism and reflects various aspects of your life, relationships, and emotions.

1. Grandfather's Beach House and Cars: The setting of your grandfather's beach house suggests a connection to family and nostalgia. The cars represent your and your husband's roles or identities in your relationship. The reversal of parking (your Jeep on the left, his Chrysler on the right) may indicate a shift in dynamics or a feeling of wanting to align your lives in a different way. It could symbolize a desire for collaboration or harmony in your relationship.
2. Walking the Dogs: The act of walking your dogs can symbolize responsibility and care, especially since you had more dogs in the dream than in reality. This might reflect feelings of being overwhelmed or the need to take care of more than you are currently managing. The encounter with the other woman and her dogs could represent external challenges or competition in your life, while letting your dogs off-leash suggests a desire for freedom or to escape from stressful situations.
3. Veterinarian Visit: The visit to the vet, especially the interaction with the nurse, highlights feelings of inadequacy or guilt regarding your care for Luna. This may mirror concerns about making the right choices in your life, whether it's about your pets or other responsibilities. The nurse's disgust could symbolize outside pressures or judgments you feel from others about your decisions.
4. Driving in the Snow: The snowy environment could symbolize obstacles or challenges you are facing. The man driving you in an expensive car might represent someone in your life who is influential or provides guidance. The concerns about parking and the encounter with the bouncer could reflect anxieties about fitting in or being accepted in certain social or professional environments.

Overall, your dream seems to touch on themes of responsibility, family dynamics, feelings of inadequacy, and navigating external pressures. It may be beneficial to reflect on your current life circumstances and consider if there are areas where you feel overwhelmed or judged. Talking things through with your husband could help foster understanding and support.