Welcome to YT.
I would think a yorkie running along a bike would be very dangerous. Even though yorkies get the "zoomies" and run at warp speed around the yard or the house, this is a very short distance and that speed cannot be maintained by their little bodies safely. If you were to speed walk with your yorkie, they are already at a run and I would think that is more than fast enough and much safer. Just my opinion....
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