To answer your question, luxating patellas are very common in Yorkies and other toy breed dogs. It is usually genetic, but can happen (or get worse) from jumping on and off furniture.
As the others have said, get a second opinion from an orthopedic vet. If it really is grade 3 or 4, surgery is a must as otherwise he will end up with painful and crippling arthritis later on and it will be too late to do surgery. |