My very 1st yorkie ever purchased I bought from a breeder for $300 with no papers

Uneducated of course.
He';s 4 years old, 13 pounds and neutered. He ended up having Lp in both knees. He had to have surgery TWICE. ON BOTH KNEES! I love him to death and wouldn't change a thing.
He does fine, still runs and plays like normal.