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  Thanks everyone for your speedy replies.  The little bit of foam is at the corners of his mout and is white.  Yes, he is less than a year old.  Good thingthat she keeps NutriCal with her.  I googled "Hypoglycemia symptoms in yorkies", and it sounds like what my BFF's puppy has.  I have her puppy's sister and she has been fine.  I told her what I read and what you guys said, and she is taking him to the vet post haste!  
 I'll keep you all updated.
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