You could try the vet specialists that my daughter takes her maltese to (she has cardiac problems). This practice has a number of different specialists there and everyone I met from the doctors, to nurses to the receptionists, was very kind and caring.
It's called the Hope Center for Advanced Veterinary Medicine, located in Vienna, Virginia (northern VA). Below is their website:
Welcome to The Hope Center for Advanced Veterinary Medicine in Vienna, Virginia
You'd need the surgical practice in the group and here's their website:
VSC: Veterinary Surgical Center - Doctor Anke Langenbach - Vienna, VA
They list LP as one of the surgeries they specialize in.
Good luck with your boy.