Welcome to YT, your baby is just beautiful. There in not a huge difference between a silky and a yorkie. A silky is a larger version of a yorkie whose hair does not grow as long as a yorkie, it stops about an 2 to 4 inches past it's stomach. They have the same personality, prey drive, mischievous ways of yorkies. "If" you have a yorkie silky mix, you have the best of two breeds. She is a beautiful lil girl, At 17 weeks old and only 3.6 pounds I don't think she is mixed with silky, if she were, at 17 weeks old she would weigh more the she does.
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