Cat still vomiting after sensitive stomach food?

Three different sensitive-stomach brands and still vomiting — that's a real pattern, and it tells us something useful. Digestive sensitivity in cats is usually down to food intolerance rather than true allergy, and many 'sensitive stomach' products still share the same common triggers: chicken, cereals, and artificial additives. The fact that switching between those brands hasn't helped suggests your cat may be reacting to an ingredient that runs across all three. What are the symptoms exactly — vomiting bile, bringing up undigested food, something else? How long has it been going on, and what's the most recent food you've been using?

That's really helpful — and honestly, that pattern makes a lot of sense. All three of those foods use chicken as the primary protein, and that's one of the most common intolerances in cats. Vomiting undigested food quickly after eating can also point to eating too fast, but given six months of consistency across three products, the protein source is the more likely culprit. Before I suggest a food, a couple of quick questions: is your cat indoor only or does she go outside, and is she on any medication or has she had any health checks for this recently?

Good — a clean bill of health and a vet who's pointed you toward diet is exactly the right starting point. Given that she's been reacting to chicken across all three foods, what you need is a genuine novel protein she hasn't been exposed to before. My recommendation is Canagan Grain Free Cat Food in the Scottish Salmon recipe. It's a single named protein source, grain-free, and has no chicken or poultry whatsoever. The ingredient list is clean — no artificial additives, no fillers — which removes the common triggers in one go. It's a high-meat wet food, which is also easier on the digestive system than dry kibble for a cat with this kind of sensitivity. The key is introducing it gradually over about ten days, mixing increasing amounts with whatever she's eating now, so her system can adjust without the switch itself causing an upset.

It's a reasonable assumption but actually the opposite tends to be true. Fish-based foods — particularly salmon — are often easier on sensitive stomachs than poultry, partly because the protein structure is different and partly because quality fish recipes tend to have shorter ingredient lists. The main thing to watch for with fish is sourcing and freshness, which is why I'd stick with a brand like Canagan rather than a budget fish food. The only caveat is that fish shouldn't make up every single meal long-term due to mercury accumulation risk, but rotating it as the primary food is absolutely fine and well within safe limits for an indoor cat.

If the chicken was the main trigger, you should see a meaningful reduction in vomiting within two to three weeks of being fully transitioned. Some cats improve faster. If she's still vomiting at the same frequency after four weeks on the new food exclusively, it's worth going back to the vet to investigate other causes — motility issues or stress-related vomiting can sometimes look identical. But given the clear pattern you've described, I'd be fairly confident a proper protein switch will make a significant difference.