Friend, when we see blood in the vomit and stool this is a sign of inflammation in the gastrointestinal tract. Certainly, the ingestion of toilet cleaners can be very irritating to the upper gastrointestinal tract and cause ulceration which can lead to vomiting blood. However, in this case, you are also seeing blood in the feces which is coming from the colon (large intestines) which leads me to believe there could be something else going on. There are many different types of medical conditions that would cause these symptoms. Unfortunately, it will not be possible for me to pinpoint the exact underlying cause without a hands-on examination and some testing, I am sorry. But, common causes are ingestion of a foreign body, infections, toxicity, or even part of a systemic disease. To determine the exact underlying cause he will need a hands-on examination by a veterinarian, blood work and x-rays as an initial screening test. Pending test results the attending veterinarian will start him on a supportive care of IV fluids, anti-emetics, etc. In the meantime, until he is seen by a veterinarian this is what you can do:
1- Do not give things like Pepto Bismol or Imodium. 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 3-4 hours. Need to give his gastrointestinal tract time to rest.
3- After 3-4 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 your family veterinarian as soon as you can. If cost is a concerned look into your local ASPCA or Shelter where they often offer veterinary services at a lower cost.
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