My name is***** and I am sorry to hear that Babygirl is having problems this evening. Can you be more specific when you say that he is "shaking like can't she breathe?" Also you say that she is 4 years old, but call her a puppy? Can you confirm her age?
Next, is she still conscious and responsive or is she unconscious? Can you see her gums? What color are they, medium pink I hope or pale or red? Did she lose control of her bowels or bladder?
There are several possibilities for the cause of shaking. I would wonder about seizures, exposure to a toxin, shivering, choking, low blood sugar and electrolyte problems.
I would strongly consider taking her to your local animal emergency room this evening as soon as possible if she is indeed having trouble breathing.
Best regards, ***** ***** this answer helps you. Please message back if you have any more questions.
Kansas State University,
College of Veterinary Medicine Class of 2001