Friend, vomiting can be caused by many different conditions. It will be difficult for me to determine the exact underlying cause without a hands on examination and some testing. But, common causes are: A simple gastritis, dietary indiscretion, pancreatitis, ingestion of a foreign body, infections, etc. to name a few causes. Her panting could be a sign of gastrointestinal discomfort, a fever (infection), etc. To determine the exact underlying cause she will need a hands on examination by a veterinarian as so many medical conditions share the same symptoms. In the meantime, in any case of vomiting the first thing to do is give the stomach 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 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 8-12 hours. Need to give her gastrointestinal tract time to rest. Keep her indoors in a cool room while fasting.
3- After 8-12 hours offer a small amount of water. Wait half hour, if no vomiting, offer 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- If she continues to vomit while she is being fasted I would have her checked by ER vet otherwise follow up with your family veterinarian for a hands on examination.
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