Here are premium cat‑food brands (and the digestive‑health lines they offer) that are commonly recommended for cats with sensitive stomachs or GI issues:

• Royal Canin — Digestive Care (retail) and Veterinary Gastrointestinal (prescription) formulas for improved stool quality and balanced intestinal flora. (royalcanin.com)
• Hill’s — Science Diet Sensitive Stomach & Skin (OTC) and Prescription Diet i/d (therapeutic) — both designed for easier digestion and improved stool quality (i/d uses a clinical prebiotic blend). (hillspet.com.au)
• Purina Pro Plan — Sensitive Skin & Stomach (OTC) and Pro Plan Veterinary Diets EN Gastrointestinal (therapeutic) with highly digestible ingredients, prebiotics and probiotic support. (purina.com.au)
• IAMS — ProActive Health Sensitive Digestion & Skin formulas that include targeted fiber blends (prebiotics, beet pulp) to support nutrient absorption and gut health. (iams.com)
• ADVANCE (Australia) — Sensitive Skin & Digestion (Australian-made super‑premium) with colostrum, fermentable prebiotic fibres and other gut‑supporting ingredients. (woononapetfoods.com.au)
• Farmina — N&D (Digestion) and Farmina Vet Life Gastrointestinal lines; both offer highly digestible formulas with prebiotics/FOS and fibre tailored for GI issues. (farmina.com)
• Blue Buffalo — BLUE Basics (limited‑ingredient) line formulated for gentle digestion with single protein sources, pumpkin/ fibre and probiotic extracts. (bluebuffalo.com)
• Instinct (Nature’s Variety) — Limited Ingredient Diet (LID) formulas (single protein + simple carbs) aimed at food sensitivities and easier digestion. (instinctpetfood.com)

Quick notes and tips

• What these formulas commonly provide: higher digestibility, limited or novel proteins, added prebiotic fibres (inulin/FOS), and in some cases guaranteed probiotics or probiotic strains — all aimed at improving stool quality and lowering GI upset. (royalcanin.com)
• Prescription (veterinary) gastrointestinal diets (examples above: Hill’s Prescription i/d, Royal Canin Veterinary Gastrointestinal, Purina Pro Plan Veterinary EN, Farmina Vet Life) should be used under your veterinarian’s guidance. (hillspet.com.au)
• If your cat has ongoing vomiting, diarrhoea, weight loss, blood in stool or appetite changes, seek veterinary assessment before switching diets.

If you want, I can:

• Narrow this to brands and formulas readily available in your area (Australia) and list local retailers, or
• Suggest 2–3 specific formulas to try based on your cat’s symptoms (vomiting, loose stool, hairballs, etc.).