
There are a number reasons you might want to get your dog hip scored. The first and most obvious is for breeding purposes. If you are showing your dog and is is winning a fair bit, then you will get stud enquiries, so why not be prepared?
Another reason is to get the dog hip scored is the more dogs scored the more realistic the average score for the breed will be. If every dog was scored whether a pet dog, a show dog or working dog , then all the breeds would have a much clearer idea of the breed's average score.
As a breeder I like my puppy owners to get their dogs hip and eye tested, it gives me an idea of how my lines are healthwise.
As an owner I hip and eye test all my dogs even those I don't use for breeding, as I am interested in the scores/results of each dog, and it gives me an idea of what problems I may or may not have to watch out for.
As to having a general anesthetic, there are vets around the country who do hip scoring using a mild sedative.