Cat food for rescue cats with sensitive stomachs

Rescue cats with unknown diet histories are a really common source of digestive upsets — you genuinely don't know what they were eating before, so their gut can struggle to adjust. Digestive sensitivity in cats is usually food intolerance rather than a true allergy, and limited-ingredient or novel-protein diets tend to work best because they reduce the number of things that could be causing a reaction. Before I suggest anything specific: what symptoms are you seeing — vomiting, loose stools, something else? How long has this been going on since you brought them home? And what are you currently feeding them?

That's really useful context. Six weeks in with twice-weekly vomiting and loose stools points strongly to the food itself rather than stress settling — by six weeks most adjustment-related upsets have resolved. Supermarket own-brand dry foods tend to have long ingredient lists with multiple protein sources, which makes it very hard to identify what's irritating her gut. The other issue is that dry-only diets can be harder to digest for sensitive cats. What protein sources are listed on the bag she's currently on — do you know if it includes chicken, beef, fish, or a mix?

That's exactly the pattern — multiple proteins and a long ingredients list makes it almost impossible to know what's triggering her. Given her unknown history, I'd treat chicken and turkey as potentially problematic proteins until proven otherwise, because they're in almost every mainstream cat food she may have eaten before. The approach I'd recommend is switching her to a single-protein, limited-ingredient wet food using a novel protein she's less likely to have been exposed to repeatedly. My specific recommendation is Forthglade Natural Grain-Free Wet Cat Food in the duck variety. It has a short, clean ingredients list, uses a single animal protein source, and the wet format is genuinely easier on a sensitive gut than dry kibble. It's available on Amazon UK in multipacks. I'd transition her over seven to ten days — mixing increasing amounts of the new food with decreasing amounts of the old — and you should see a clear improvement in stools within two weeks if the food is the cause.

For a cat with active symptoms, I'd drop the dry food entirely during the trial period — at least four to six weeks. If you're feeding multiple foods at once and she improves, you won't know which one was the problem. Once she's been stable for a month on the Forthglade duck, you could cautiously reintroduce a single dry food if you want to — but choose one that's also limited-ingredient and uses the same protein source. Mixing wet and dry from different brands with different proteins defeats the point of the elimination approach. Keep it simple for now and let her gut settle.

Yes — a few things worth watching. Some looser stools in the first three or four days of the transition are normal and not a reason to stop; it's the trend over two weeks that matters. If the vomiting increases rather than decreases in that window, stop and see your vet, because persistent vomiting in cats can occasionally point to something beyond diet — inflammatory bowel disease, for instance. Also make sure she has constant access to fresh water; wet food increases hydration but some cats drink less when switched to it and then compensate unevenly. If she's stable and symptom-free at the six-week mark, you've almost certainly found the culprit.