Hi Kelly --
> Logan occasionally has some diarrhea, but his main symptom has been
> inappetance. He was in remission from Jan 2007 until Sept 2009. He's
> never had pancreatitis.
Okay, good. You might want to try a raw food diet. Those are usually fine for regular cats and good for diarrheal cats, but can be problematic in cats with constipation issues. Some of the commercial raw food diets can be high in fat, and thus can be contra-indicated in some pancreatitis cats; and ISTR that there are a few that are higher-than-we'd-normally-like in carbs, at least for diabetics. The raw food numbers are at the bottom of the canned food charts.
You can get raw food from some pet retailers; the one time we tried raw food, we went with Nature's Variety, solely because they had a trial buy-one-get-one-free offer, which is still available here
http://www.naturesvariety.com/tryit. In order to get the coupon, you'll need to know the name of a local store which carries the raw food; you can find that out here
http://www.naturesvariety.com/locator.
You can also make your own raw cat food; there are recipes on Dr Lisa's site here
http://www.catinfo.org/makingcatfood.htm. That'll let you control the specifics of the diet, including percentage of fat, and will probably save you some money. But you might want to try one of the commercial diets first to see if Logan takes to it and how well he does on it before you invest in a meat grinder.
I will say that when we tried the raw food diet, I had problems getting Gwyn interested in it. I think that's partly because it was served cold from the fridge and she just didn't like that. I did try microwaving it for a few seconds to warm it up; she liked that better, but the food seemed to go stale faster. Tried adding warm water to the medallions, but I didn't like the resulting consistency. What finally worked for us was for me to take the defrosted medallion out of the fridge and beat it strenuously with a fork until it was a sort of puree. That made it easier for Gwyn to lap it out of the bowl (she has lingual dexterity issues due to a stroke), and it also warmed it up to a temperature that she liked without letting it go stale early. If you do decide to try a raw food diet, you might try posting for hints on making it more appealing to cats.
> They said the IBD was moderate and it's located in the small intestines, only.
> So the B12 can be injected using insulin syringes? That's good - I get monthly
> B12 shots and the needle is pretty big and it hurts so I was already worrying
> about that! I hate causing him pain!
I give Gwyn 1/4 cc (or 25 units on the insulin syringes we use

) twice a week, and it gets injected just like the insulin -- we even use the same site rotation. It'll make a little larger under-skin lump than the insulin, but they're pretty much painless. And any excess B12 is generally just urinated away, so it's safe as well.
You should be able to get injectible B-12 from your vet; I've been able to special order it at about half the pharmacies I've tried, but you often (always?) need a prescription; and a lot of folks have found it available without a prescription at their local feed stores. I spend $10-15 per vial and it lasts me over a year. Please note that B-12 is light-sensitive and, to preserve it's effectiveness, I keep it in a dark cabinet despite the brown bottle.
Also, I'm glad that you're trying prednisolone. Sometimes vets recommend prednisone (prednisone turns into prednisolone after being processed by the body), but prednisolone can have the same impact with a lesser dose. At least in most cats; as always, Gwyn seems to do better on prednisone than prednisolone :shrugs: . But my recommendation would be for prednisolone first.
You'll probably have to do the steroids for a while, to try to get the IBD under control, and then hopefully you'll be able to wean Logan off them, particularly if you can control the symptoms in other ways. Note that steroids in general tend to increase appetite, so expect his appetite to decrease somewhat during the weaning process and don't panic when you notice it decrease
You may also want to speak with your vet about whether putting Logan on Pepcid A/C or Zantac might be beneficial. I know that Zantac has helped my Gwyn a lot.
Finally, you may want to joint the feline IBD group at Yahoo here
http://pets.groups.yahoo.com/group/FelineIBD. Most of the cats there are dealing with the diarrheal form and they may be able to provide you with more specialised help should you need it. (Since Gwyn has the constipating form, they've been less able to help her and I don't spend a lot of time on their group; if you ever want to PM me, please do it here.) Their first suggestions, however, will be the B12 supplementation and to suggest trying a raw food diet.
If you've any other questions, feel free to ask
Peace --
Jean and her Gwyn