Natalie, diarrhea, and vomiting can be caused by many different medical conditions. It will be difficult for me to determine the exact underlying cause without a hands-on examination and some testing, I am sorry. But, common causes in a puppy are dietary indiscretion, intestinal parasites, ingestion of a foreign body, infections, etc. to name a few causes. The fact that this has been ongoing for 36 hours I would strongly recommend having her checked by a veterinarian as soon as you can for a hands-on examination and fecal analysis as an initial screening test. In the meantime, in any case of vomiting and diarrhea the first thing to do is give the gastrointestinal tract time to rest. This is what you can do:
1- Do not give things like Pepto Bismol or Imodium. Start her on Pepcid AC (famotidine) 10mg 1/2 tablet every 12 hours for the next 2-3 days. You can buy Pepcid AC over the counter in any pharmacy.
2- No food or water for 4-6 hours. Need to give her gastrointestinal tract time to rest.
3- After 4-6 hours offer a small amount of water. Wait half hour, if no vomiting, offer a small amount of rice (50%) and boiled boneless chicken or ground beef (50%) 4-6 times a day. Keep on this diet for several days then wean into regular diet.
4- Follow up with a veterinarian for a hands on examination as soon as you can.
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