Short answer — brands that are known for high‑protein lines (good for active/working dogs) include:

• ORIJEN (Champion Petfoods) — examples: ORIJEN Original / Amazing Grains; many formulas are high‑protein (around 38%+ crude protein on the guaranteed analysis). (orijenpetfoods.co.uk)
• ZIWI Peak — air‑dried and canned recipes are very protein‑rich (some air‑dried recipes ~38% crude protein). (ziwipets.com)
• Purina Pro Plan SPORT (Performance) — purpose‑built performance formulas (about 30% protein for SPORT 30/20 lines). (purinaproclub.com)
• Wellness CORE — concentrated, grain‑free “CORE” recipes (typically ~34% crude protein). (wellnesspetfood.com.au)
• Diamond Naturals Extreme Athlete — designed for high energy dogs (examples ~32% crude protein, high calories/fat). (1800petmeds.com)
• Merrick (Grain‑Free / Classic lines) — several recipes in the low‑to‑mid 30s % protein range (varies by formula). (petco.com)
• Taste of the Wild — “High Prairie” and other recipes ~32% protein (popular for active dogs). (tasteofthewildpetfood.com)
• Instinct (Nature’s Variety) — Raw Boost / Raw‑added and some grain‑free formulas with higher protein (some Raw Boost recipes 31–35%+). (instinctpetfood.com)
• Farmina N&D — “N&D” and Ancestral Grain/Prime lines emphasize animal protein (many formulas 30–34%+; also list % from animal sources). (farmina.com)
• Nulo FreeStyle / High‑Protein lines — labelled “high‑protein” formulas in the FreeStyle range (protein varies by recipe, e.g. high‑protein variants). (nulo.com)

Quick buying notes (important):

• Check the guaranteed analysis on the bag and, when comparing foods, convert to dry‑matter basis (or compare grams of protein per 1,000 kcal) — AAFCO/FEDIAF set minimums, but active/working dogs commonly benefit from higher levels (many working dogs do best in the mid‑ to high‑20s up to low‑30s % crude protein on a dry‑matter basis). (petmd.com)
• Protein quality matters: animal‑based proteins (meat, meat meals) provide essential amino acids and are generally better for performance than plant‑only proteins. Read ingredient lists, not only % protein. (akc.org)
• Watch calories and fat as well as protein — performance formulas often have higher calories/fat to fuel endurance; feeding amounts must be adjusted to maintain ideal body condition. (1800petmeds.com)
• If your dog has health issues (kidney disease, pancreatitis, food sensitivities) or you’re switching diets, check with your veterinarian or a veterinary nutritionist before moving to a much higher‑protein or higher‑fat formula. (petmd.com)

If you’d like, tell me: your dog’s weight, breed/age, and how many hours per day they’re active — I can suggest 2–3 specific formulas (available in Australia) and approximate daily feeding amounts based on calories.