I agree with Dixieland Dancer "and BE PATIENT!!!"

2 of my dogs went through a fear period around this age.

Sheba would not walk near a man hole cover on the
side walk when she was a puppy.
It took me almost 3 months of calmly working with her and
desentising her to the evil covers on the ground. lol

Rocky's fear only took 2 weekends to cure.
Rocky had a fear of steps at the breeders
and the breeders husband thought it was funny.
The husband purposly pushed him off the porch steps
and Rocky hurt his leg and his fear of steps
becaue MEGA fear.
So I took him to the park in the kiddie section
and worked with him up at the play area.
I would go up the kiddy
step myself first several times coaching him and
never forcing him. Than after several times
of coaching, working very slowly he went up
the couple of steps. After that their was no stopping him and
even today I periodically take him to the kiddie section
and we climp up the baby steps, and go down the slide
together.