Friend, the concern with the ingestion of pig foot is that the bones could become obstructed in the gastrointestinal tract; vomiting could be an early indication of a bone being obstructed. I am going to make some recommendations below, if she continues to vomit during or after the below recommendations I would have her checked by a veterinarian for xrays as initial screening test. This is what you can try:
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 6-8 hours. Need to give her gastrointestinal tract time to rest. Keep her indoors in a cool room when fasting; no exercise.
3- After 6-8 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 her on this diet for several days then wean her into her regular diet.
4- If she continues to vomit after doing the above she will need to be seen by your family veterinarian for a hands on examination and xrays. If cost is a concern look into your local ASPCA or Shelter where they often offer veterinary services at a lower cost.
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