I have a 6 month old Australian Terrier that is really afraid of walking outside. I have noticed that she is not entirely scared of the outside but of the noises that surround her. I have walked her outside at night and she is perfectly fine with her tail up until a car passes by or any other loud noise. I have tried walking her throughout the day but as soon as I walk out my door she lays on the floor and heads straight back home. I have tried treats but she completely rejects them. She has gone to dog parks and plays but stops and tries to find an exit when a loud noise is made while the others continue on to play. I have taken her on walks with my brother's 5 month old Vizsla and she walks extremely well compared to how she walks with me on her own but, still stops and freezes when there is loud noises. I have also tried staying on my porch for 30 minutes to 1 hour 3 times a week but she shows no sort of improvement. I would really appreciate any sort of tips. Thank you!