He looks 100% Yorkie to me. He reminds me of my Piper. She's AKC, leggy, long (as long as tall), silky, almost 2 years and weighs 5.5 lbs. When she was 7 months old I noticed that her back seemed hunched. Come to find out she had Legg Perthes (hip abnormality). Her back look hunched because she was in pain when she walked.
__________________ Mom to Piper  &  Chipper |