MY LAB PUPPY HAS GOTTEN MORE AND MORE LETHARGIC OVER THE LAST FEW DAYS. HE IS NOT EATING AND LOSING WEIGHT. HE IS VOMITING (EVEN WATER SOON AFTER HE DRINKS IT). I CAN'T GET HIM INTO A VET UNTIL MONDAY. HE IS A LITTLE BEHIND IN HI SECOND SET OF SHOTS. DOES ANYONE HAVE ANY SUGGESTIONS.