Suggestions needed for fiber

My cat Gwenny has idiopathic interstitial cystitis, plus a history of intestinal problems. Before the diagnosis of IC, she had been on Eukanuba Indoor or Hairball dry food, because that was the only food I had found which gave her firm stools. Since the diagnosis, I have been trying to transition her over to wet food, but everything I have done so far has not worked for her--she has had consistantly runny, loose stool, with lots of forcefully ejected gas and gunk. This went on for several months, while I tried different foods and fiber additives. At the vets suggestion, I stopped trying to give her wet food last week and am now trying Purina EN dry. So far, she is better intestinally, but she is peeing out of the box more and I am afraid her IC problems are worsening again. What I need to do is find an effective fiber source that I can mix with wet food. My thinking is, by looking at the ingredients of the Eukanuba hairball--which worked for her intestinally--I could maybe figure out what what would work best for her in wet food. I've already tried enzymes, probiotics, pumpkin, Benefiber and psyllium husks (although maybe not enough), but don't know what else might be useful. I asked the vet, but he said I would have to determine whether soluble or insoluble fiber works best for her. I was wondering if some of you experienced people could look at the ingredients in the Eukanuba and maybe have some suggestions as to what worked for her in the dry food that I could put in the wet. Here are the ingredients for Eukanuba hairball formula:
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Chicken, chicken by-product meal, chicken liver, corn grits, chicken by-products, fish meal (source of fish oil), corn meal, dried beet pulp (sugar removed), powdered cellulose, chicken fat (preserved with mixed tocopherols, a source of vitamin E, and citric acid), dried egg product, natural chicken flavor, potassium chloride, calcium carbonate, ground whole grain sorghum, dl-methionine, brewers dried yeast, vitamin E supplement, choline chloride, salt, zinc oxide, niacin, ascorbic acid, manganese sulfate, vitamin A acetate, calcium pantothenate, biotin, rosemary extract, thiamine mononitrate (source of vitamin B1), pyridoxine hydrochloride (source of vitamin B6), vitamin B12 supplement, copper sulfate, riboflavin supplement (source of vitamin B2), inositol, vitamin D3 supplement, folic acid, potassium iodide, cobalt carbonate.

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Thanks for any suggestions you might have.

My cat has chronic colitis. I tried psyllium powder additives in the food for a long time, but it turned out that it just wasn't enough extra fiber. I finally switched to Royal Canin prescription CC High Fiber food... and the results have just been fantastic. I was able to stop giving him the medication he was taking for colitis within a few days, and he now does better than he ever did on medication.

I can't recommend this enough. Also, the cat seems to really like it -- even the wet food, which he doesn't usually like. It has both soluble and insoluble fiber.

If you do switch over to this or another prescription high-fiber food, it's very important that you introduce it gradually. I did 1/3 new mixed with 2/3 old for three days, then 2/3 new and 1/3 old for three days, and finally all new.

It does sound like some complicated things are going on with your cat that fiber alone may not be enough to solve. Another vet visit might be in order.

I don't know that it's a good idea to eliminate wet food entirely. The extra moisture can be very helpful in some kinds of bowel conditions.

Thanks for the recommendation of the Royal Canin prescription CC High Fiber canned. I will ask the vet about this. I have tried Science Diet hairball canned food, which has a high amount of fiber, and it has worked somewhat, but I think it still needs something else to make it beneficial for her. The vet has recommended Purina OM canned, but I haven't tried it yet. She is doing better intestinally on the new dry right now, so I want to see how she reacts to this and give her a break from the intestinal problems before I start experimenting on the canned again.

Thanks again for the suggestion.