HI There and welcome to YT .. I have a Yorkie that has a Short back left leg. She does not have LP or LS or anything.. When she was Tiny tiny her mom laid on her and broke her leg in the growth plate.
we did have her tested and x ray and the x ray showed a old fracture. My mom is her Breeder She never knew this happened Daisy or her mom did not show any indication that she was hurt.
So keep your Chin up it might not be too bad... Daisy is 6 years old and Doing GREAT