vomitting dogs

Question
i have 6 Chihuahuas. they have been vomiting for two days while the other 3 are fine. it is frothy yellow and then clear. they don't even want to drink.
no eating either.
they just lay around and only get up when someone new comes home.please advise

Answer
Hi Sylvia, Are they puppies?  If so, how old are they?  Have they been wormed lately?  If puppies, was the mother wormed before she was bred?  This is important as she could have passed worms on to her puppies.  Also, if they are puppies, have they been vaccinated?  Let me know,

Dawn