Friend, when we see bloody diarrhea this is a sign of inflammation in the large intestines (colon). The vomiting is secondary to what is causing the inflammation. This can be caused by many different medical conditions. I will not be able to pinpoint the exact underlying cause without a hands-on examination and some testing, I am sorry. But, common causes are dietary indiscretion, ingestion of a foreign body, infections, or even part of a systemic disease to name a few causes.
In this case, I would recommend a hands-on examination with your family veterinarian, fecal analysis, blood work and x-rays as an initial screening test. Treatment will be based on exam and test results. In the meantime, this is what you can do:
1- Do not give things like Pepto Bismol or Imodium. Start him on Pepcid AC (famotidine) 10mg 1/8th of a tablet every 12 hours. You can buy Pepcid AC over the counter in any pharmacy.
2- No food or water for 3-4 hours, need to give his gastrointestinal tract time to rest. Then, offer a 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.
3- Supplement with a probiotic, these are friendly bacterias that help with regularity and inflammation. You can buy this over the counter in any pet store.
4- Follow up with your family veterinarian for a hands on examination as described above. If cost is a concerned I would look into your local ASPCA or Shelter where they often offer veterinary services at a lower cost.
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