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  I imagine they are getting tummy aches off and on.  You could call the vet and see about giving them some Kayopectate. (I think I spelled that wrong.)  
 My shih tzu is prone to tummy troubles and the vet takes her off food and water fo 24 hours to give her insides a rest, but I think yorkies are to small and delecate to miss a meal and water.
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