well the only way I knew my pup (which wasnt a yorkie) was in labor... she started having some blackish discharge and would not leave my lap... she was whining alittle on and off. Within hours she had started pushing. I never saw any difference in her like dilating or anything. She did quit eating so I gave her nurti-cal and syringe fed her water.
heres a link to tell you more
The Onset of Dog Labour & Delivery
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Zsa Zsa and Pixie have me wrapped around their paws
"Whoever said you can't buy happiness forgot little puppies"