Tilly was diagnosed with IBD nearly 5 years ago; she lost over 1/3 of her body weight and at several times I (and the vets) thought that her number might be up. However after struggling for a long time to find anything at all that she could tolerate other than cottage cheese and rice - we tried every prescription diet going and none worked - I found (by mistake initially) that she could digest Skinners Field&Trial duck and rice kibble. She's still going strong on it now and it's still the only thing she can eat in any appreciable quantity. I know of a few other IBD dogs who can also eat Skinners. The dog will likely need to be tried on novel proteins - the usual chicken, lamb etc. that dogs are usually exposed to are no good for most IBD dogs. Duck obviously works for Tilly - as time has gone on she has become able to stomach small amounts of duck wet food and some treats too which she couldn't initially have had. She can't have meat (raw or cooked) in any significant quantities though, and definitely no bones or we all suffer the consequences! That said, her stomach is immeasurably better than it used to be and I can't remember the last time she had a really bad flare up, it's been several years. Other 'novel' proteins that could be worth looking at are venison, rabbit, ostrich, bison etc.