I am fairly sure I have mentioned this before to you. You might want to contact an Aby breeder in your area of the country as Abys are known for having the problem you are talking about with your kitty. Aby breeders often stop breeding a particular cat because of this and other inbred illness tendancies. The breeders will have the experience and will have some up front answers for you I am sure. Many vets have never seen an Aby and don't know about their weaknesses.

I would bet that this illness is why Micah was dropped off at the shelter. It can be an expensive situation. Many people will not go to the length or expense to deal with IBD as I don't think there is a a cure, just treatment, long term. I hope I am wrong about IBD in cats, but that is what I recall having heard about Abys and IBD.

My two, Miley and Graemer were being treated for a version of IBD and are/were put on W/D - high, high, fiber prescription Science diet. It surely helped. Miley still has a mild bout every now and then.

Hope this helps.