
Unfortunately I'm not in your area, but would want to have a different practice look at this pup. Any experienced vet can confirm LP without an x-ray. And it was the first diagnosis I would have expected for the breed.
I've had the patella op on 3 toy breeds with a very satisfactory outcome. The first in the early 70's and my last one was about 3 years ago. The secret is to do as your told, and crate the pup for 12 weeks. Yes, I do mean 12 weeks, after the surgery. My last successful operation was a Yorkie bitch who was a bloody nightmare to keep still. At one point I thought I would have to nail her feet to the ground. But it was worth it.
Any people who have told me that the surgery was not a complete success, when questioned, have admitted to me that they didn't have the strength of mind to contain their pet for the full 3 months. Big, big mistake. I never begrudge paying for x-rays that are needed, but my vet has always been able to slip the kneecap in and out, and tell if it is not going to go back in naturally by itself. Referral may well not be needed if you're using a veterinary hospital like me. Do, however, be assured that if LP is the diagnosis, they are not trying to fob you off with price. I have had one bitch that needed both done, and two that got away with just the one patella. Do expect to pay around £700 per knee. It is
not a simple operation. Indeed, with my last bitch my vet said that he was glad he wasn't newly qualified when he saw just how bad it was, as he wasn't sure he'd have had the nerve to go ahead.