Hi,
It took Lexie over a year to get used to a school bus. She still looks back at every car that drives by..lol. It does take time. I praise her a lot. I will say bus.. bus and praise. It took awhile. I am a firm believer with time, praise and consistency they can improve. We had a trainer who told us "lexie could never be a therapy dog she is too nervous." I worked and worked with her and she has now been a therapy dog almost 2 years. Hang in there. Make a big deal about seeing things with praise and hugs.
ps. on garbage day , Lexie still thinks the "monsters" are going to sneak up on her...lol