Here are common dog‑food labels (brands) that offer specialised weight‑management formulas, with one or two example products and whether they’re retail or veterinary/prescription. All are available (or have product pages) in Australia:

• Royal Canin — Light / Light Weight Care (retail) and Satiety Weight Management (veterinary/prescription). (royalcanin.com)
• Hill’s — Science Diet “Perfect Weight” (retail) and Prescription Diet r/d (prescription weight‑reduction formula). (hillspet.com.au)
• Purina — Purina ONE / Pro Plan Healthy Weight / Pro Plan Weight Management (retail) and Pro Plan Veterinary Diets OM (overweight management, veterinary). (purina.com.au)
• Eukanuba — “Fit Body” / Weight Control (retail weight‑control lines). (eukanuba.com)
• IAMS — IAMS Healthy Weight (retail healthy‑weight formulas). (iams.com)
• Blue Buffalo — Healthy Weight recipes and BLUE Natural Veterinary Diet W+M / W+U weight‑management veterinary lines. (bluebuffalo.com)
• Wellness — CORE Reduced‑Fat / Reduced‑Fat (weight management / reduced‑calorie retail formulas). (wellnesspetfood.com.au)
• Nutro — Wholesome/Natural Choice weight‑management formulas (retail). (petology.com.au)
• Advance (Mars Petcare; Australian brand) — Advance Healthy Weight (retail; marketed in Australia). (petsdomain.com.au)

Notes:

• “Weight management” formulas commonly reduce calories/fat and increase fibre and/or L‑carnitine and protein to help dogs lose fat while preserving lean mass; individual product formulations differ (read labels or the product page for specifics). (See examples above.) (hillspet.com.au)
• Some effective diets are veterinary‑only (prescription) — e.g., Hill’s r/d, Royal Canin Satiety, Purina Pro Plan Veterinary Diets OM — and should be used under veterinary guidance. (hillspet.com.au)

If you’d like, I can: (a) list a few specific small‑bag or supermarket options sold in Australia with prices/where to buy, or (b) compare protein/fat/calorie numbers for 2–3 of these formulas.