How can I treat a cat with constant diarrhea?

I highly recommend taking your cat to a feline specialist or internal medicine specialist. There are four common causes of diarrhea in cats of this age, but treatments are very different, so diagnosis is essential.  I agree with Dr. Shaw about the diagnostics, GI panel at TAMU, T4 (and possibly Free T4 by ED), and biopsies.
The most common causes for intractable diarrhea in a cat this age are:

  1. Small intestinal inflammatory disease (easily treated with vitamin B12 if there is a deficiency, diet change and antiinflammatories).
  2. Small cell lymphoma (easily treated with prednisolone and chlorambucil).
  3. Hyperthyroidism (easily treated with Methimazole, radioiodine, or surgery).
  4. Intestinal adenocarcinoma (Usually treated with surgical excision).

4 Replies to “How can I treat a cat with constant diarrhea?”

  1. The suggestion for an referral to an  internal medicine specialist is a good one.
    A few things I would think worth trying for diagnosis would be intestinal biopsies (may be able to get with a scope), allergy testing, and some cobalamine testing via the GI lab.  (Assuming your vet hasn't already done these things)

    I wish you luck.

  2. Wow.  First of all, I'm so, so sorry you're dealing with this.  It's torture, and you have my deepest sympathies.

    I hate to say it, but the dog I had growing up had a very similar problem before she passed away, and in the end, I believe the issue came down to kidney function.  Specifically, kidney failure.  How is his energy level?  Is he playing?  Interested in things?  Cats can still be affectionate while still being a bit lethargic.  I'd be worried about malnutrition at this point, but it sounds like you're doing everything you can. 

    I'm not a vet, and I'm not even going to pretend to give you actual advice, I'm just speaking from personal experience.  I'll double-check with my mother in the morning, though.  If she tells me something different, I'll be back to amend my answer, I promise.

  3. I would recommend taking the cat to a veterinarian. If your veterinarian has given up diagnosing it, it's time for a referral to an internal medicine specialist.

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