Uni was diagnosed around age 3 with LP grade 2/3 in both knees. Personally I feel that surgery should be a last resort and only when the dog starts to go lame. there are many dogs with grade 4 that do not get surgery that have lived out their lives just fine.
That being said, a young dog will recover from the surgery faster than an older one. Keep in mind the recovery time is about 8 weeks of crate rest, and most likely the surgeon will do one knee, then after it's healed, the other. It's a long and expensive process.
Also keep in mind, a lot of vets try to push surgery. Mine did the same. You want to talk with a specialist and have then do the surgery, not your regular vet.
Has your yorkie been lifting or hiking her leg, favoring one over the other? Usually they will run on three legs. that is a sure sign it is bothering them. Many people will say it seems like the dog is in no pain, but if the dog is lifting the leg it obvious is bothering them. Dogs are programmed to hide pain.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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