Welcome! My name isXXXXX am a 2003 graduate from UC Davis, and currently a Medical Director of a veterinary hospital.
I am sorry to hear about this concern.
Yes, the peanut butter absolutely could be a primary cause.
My primary concerns for diarrhea with or without blood include:
- Dietary indiscretion (eating something you do not know about)
- Stomach or intestinal foreign body
- Something that was given to them (new food, new treat, human food)
- Intestinal parasitism (not just the worms, but the microscopic bugs like Giardia and Coccidia). They can cause vomiting also.
- Toxin exposure would be less likely, unless you have reason to suspect exposure to a chemical.
- Less commonly, endocrine diseases.
- Generally, in older pets, I am also concerned about organ disease (liver, kidneys) and cancer.
Red blood in the stool is known as hematochezia.Hematochezia in Dogs
Common causes can include:
1. Straining to defecate due to constipation
2. Toxin exposure
3. Stress colitis (common when a dog is startled by loud noises, having strangers at the house, a change in routine)
4. Intestinal parasites (not necessarily worms, but the microscopic bugs like giardia or coccidia)
5. A bleeding polyp or tumor in the colon (large intestine)
6. Dietary indiscretion (ate something you do not know about)
7. A foreign body that is trying to move through small or large intestinal tract.
8. Bleeding disorder including if rat/mouse bait has been recently ingested.
Because he is 10 years old, I wanted to make sure you had the above information, so we don't assume that it is the peanut butter.
To help diarrhea you can give some pepto-bismol, but I strongly discourage using it repeatedly as it can cover up a more serious problem.
Pepto-Bismol or Kaopectate
You can give it every 8 hours. The average dose is 1ml per pound of body weight, and that is the TOTAL dose for the day. So, if a pet weighs 30 pounds, they would get a total of 30ml a day or 10ml every 8 hours. This is dosing for regular strength Pepto-Bismol. If you use maximum strength liquid, give half as much.
Also, definitely ask your vet about starting a veterinary probiotic. Can be great for supportive the intestinal bacterial flora.
I hope that information has been helpful.
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