Friend, if there was blood in the vomit it is safe to assume there is something damaging or that injured the wall of the esophagus, stomach
or first part of the intestines; the diarrhea is a consequence to this. So, there could be something else going on here unrelated to the other dog's food. Possible causes are: Ingestion of a foreign body, infections, etc. to name a few causes. This is what you can try: 1- Do not give things like Pepto Bismol or imodium. You see, stopping the diarrhea with medication can make things worst if this is related to an infection or ingestion of a foreign body. In addition, if there was blood in the vomit the pepto bismol could make it worst. You can start him on Pepcid AC (famotidine
) 10mg 1/4 tablet every 12 hours. You can buy pepcid ac over the counter in any pharmacy. 2- No food or water for 8-12 hours, need to give his gastrointestinal tract time to rest. Then, offer small amount of water followed by a diet of rice (75%) and boiled boneless chicken
or ground beef (25%) until the stool is back to normal then wean him back into his regular diet. Keep him indoors in a cool room and no exercise when fasting. 3- Supplement with a probiotic (fortiflora), these are friendly bacteria that help with regularity. You can buy this over the counter in any pet store. 4- If after doing the above you do not see improvement within 24 hours I would have him checked by your family veterinarian for a hands on examination. If cost is a concern look into your local ASPCA or Shelter where they often offer veterinary services at a lower cost. My goal is to provide you with excellent service - I hope I've provided the information you were seeking, if you feel you have received anything less, please reply back as I am happy to address follow-up questions. Kindly rate me when you are done.