Need new food for 13y/o with severe allergies

My 13 year old female has severe food allergies. She can not eat anything containing grains, chicken (the meat or fat) or peas. It's very difficult to find anything that she can and is willing to eat. She was eating Nature's Variety Instinct Rabbit formula and doing wonderful on it until they changed the formula and added chicken meal. I have 5 other cats so raw feeding isn't an option. She's currently eating Great Life Salmon formula, which doesn't contain any of her allergens, but she hates it. Before she was eating Simply Nourish Sweet Potato & Salmon, but she hates that too. If she hates a food she'll eat a little bit and then leave it and the other cats will finish it, so I can't just let her go hungry until she eats because there's not food out all the time. Does anyone know of a dry food that doesn't contain any of the ingredients listed above, preferably a rabbit or venison formula. She eats Evo Venison canned food every other day.

The only dry I can think of is Ziwipeak air-dried raw which comes in venison. There's a lamb version as well.

I would also recommend Hound & Gatos canned if you haven't tried that one yet in lamb, venison, rabbit, beef and pork varieties.

I've looked at the Ziwi-peak and while it's great, it's much too expensive for me to feed. I just read that sometimes you have to switch cats over slower if the new food smells much different than what they've been eating. I've always mixed her foods when changing and I've never had this problem with her before, but as the Great Life food has a freeze dried raw coating maybe the smell is too different. I will try switching her over more slowly, but suggestions of new foods are still appreciated.

May I ask why raw is not an option? I ask because I ended up feeding my 3 cats cheaper on raw than cgeap canned. And I get control over ingredients.

In any case, good luck and let us know what you find!

I've looked into raw, it would be too expensive. In addition to the 6 cats, I have 2 dogs who both have medical issues that require daily medications. I work at a boarding kennel so I don't have any disposable income. All my cats are large and raw feeding all of them would be more than I can afford.

Wow, I just tried searching for a dry food without chicken, grains or peas, and I can't find any you haven't tried. This is a difficult one. I thought I would be able to find a novel protein one or a fish based one, but nope. Hopefully some others will come along with some suggestions.

I think you've found every grain-free, pea-free, chicken-free dry food available . There just aren't many options. Is it all grains she can't have? If there are certain grains (like oatmeal) she can have, there would be a few more options. . .