And if you can't do raw, get as close to a pure meat diet as you can. I found "Grain Free" is generally a marketing gimmick. However Merricks BG did work and seems to be free of veggies. For ibd my first choice is poultry. For ckd, ibd, and low carb, Merricks BG Turkey fits the bill.
Fancy Feast did not work and seemed to be about as bad for ibd as anything from Hills. If Grayson is intolerant of poultry, then you can try the novel proteins. For my 18 yo I'm feeding Merricks BG Turkey mixed with Beechnut turkey or chicken baby food (cuts the phosphorus and sodium a bit) along with added taurine and a phosphorus binder. It's given her a new lease on life, now more than 14 months after the vet gave her only weeks to live. It seems for her ibd was a bigger concern than ckd. I asked the vet if the food could be a problem, and she bald faced lied about it, and said no it couldn't be the food.
And the vet also said should the kitty ever eat again she could only have Hills k/d. :roll: Couldn't be more wrong, kitty survived by passing up the k/d and stealing Chip's m/d, until I had to take her(and him) off that too. I suspect the plan was to kill off the old girl before I discovered that all along it was the food that the vet was selling causing most of her problems.