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Chihuahuas are prone to hypoglycemia. Please start with karo syrup in the mouth...1/2-1 tsp...rub it on the gums and/or put it into the side pouches of the mouth so the puppy doesn't aspirate. Give the puppy about 25 minutes to respond and let me know.Dr.V
Alittle more..you can do pedialyte or sugar water too. This should boost is blood sugar IF that is the problem.
You will need to get this puppy into a vet tomorrow.