Short answer: Many pet-food brands offer and market explicit "grain‑free" lines. Common labels you’ll see emphasizing grain‑free diets for dogs include:

• Orijen (Champion Petfoods)
• Acana (Champion Petfoods) — many, but not all, Acana lines are grain‑free
• Taste of the Wild
• Wellness CORE
• Blue Buffalo Wilderness
• Merrick (many formulas)
• Nature’s Variety Instinct (Instinct Raw/Grain‑Free lines)
• Canidae PURE
• Natural Balance L.I.D. (some limited‑ingredient, grain‑free formulas)
• ZIWI Peak (air‑dried / meat‑based, generally grain‑free)
• Fromm (offers some grain‑free formulas)
• Halo (grain‑free options)

Notes and practical tips:

• “Grain‑free” on packaging is the label claim to look for, but always read the ingredient list — grain‑free foods often substitute peas, lentils, potatoes or other pulses/tubers for grains.
• Since 2018–2020, regulatory agencies and veterinary cardiologists investigated a possible association between some grain‑free diets (especially those high in peas/lentils/potatoes) and dilated cardiomyopathy (DCM) in dogs; the issue is complex and still debated, so grain‑free isn’t automatically healthier.
• Before switching your dog to a grain‑free diet, especially for long‑term use, check the ingredients, ensure the food is AAFCO‑complete (or your country’s equivalent), and consult your veterinarian so they can advise based on your dog’s age, breed, health status and nutritional needs.

If you want, I can give a shorter list of readily available grain‑free options in Australia, or check specific brands/formulas for grain‑free claims.