Masie is beautiful! I think at 10 weeks old, unless you are extremely knowledgeable of the breeder's line and saw the parents, etc. it's almost impossible to know. I think that's what makes these little pups so much fun - you just don't know. We have Darwin who is 17 months, wooly coated and he seems to be staying black and tan. I was told that Yorkies can take up to three years to change. We have our new pup 15 week old Mabel and our breeder says she will be steel blue when older - guess we'll have to wait to see! Enjoy your pup!