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Originally Posted by Little Bit I would guess that probably a long time ago that bunch of hair got pulled out. When that happens the new hair has lots more pigment and comes in darker. As it grows out it dissipates and blends in with the rest. It was apparently hidden by the longer hair over it until now and it just happens to have been long enought to have been cut to the same length as the rest this time.
In a few months or so it will probably disappear as that hair grows out more. |
Wow, the spot is a whole lot more noticeable than what I was expecting!

I agree with what Little Bit suggested, the same thought came to my mind when I looked at the picture. If she is right, and hair did get pulled out, it is possible that it's something that happened as a young puppy even before you owned him. Maybe fighting with siblings? Especially since a yorkie's hair lightens in color as they get older, that may help explain why you haven't noticed it before.