Here are cat-food brands commonly sold in Australia whose product lines (or specific recipes) explicitly avoid common fillers such as corn and soy. I list each brand with a short note and a source you can check for ingredient details — always verify the specific formula you’re buying, because recipes can change.

• Ivory Coat — Australian brand; many of their cat formulas state “no added wheat, corn, rice or soy.” (ivorycoat.com.au)
• Black Hawk — Australian brand with grain‑free cat recipes that state “no wheat, corn, barley, rice” (no corn). (blackhawkpetcare.com)
• ZiwiPeak (Ziwi) — high‑meat air‑dried/wet diets from NZ; they advertise “no grains, no corn, no wheat, no soy” and “no fillers.” (ziwipetfood.com.au)
• Feline Natural — NZ brand sold in Australia; wet/freeze‑dried lines state “No grains… no corn, soy… or fillers.” (au.felinenatural.com)
• Applaws — grain‑free wet and dry recipes with limited ingredients and “no fillers” claims (many formulas do not include corn or soy). (applaws.com.au)
• ORIJEN — premium “Biologically Appropriate” recipes; their cat ranges are grain‑free and label “no added soy, corn, wheat or tapioca.” (peekapaw.com.au)
• ACANA — sister brand to ORIJEN; many cat formulas are grain‑free and state “no added soy, corn, wheat or tapioca.” (77paws.com.au)
• Canidae (Pure / Pure Elements) — limited‑ingredient / grain‑free lines that advertise “no corn, soy, wheat or fillers.” (petology.com.au)

Quick tips when choosing:

• Check the exact ingredient list on the bag/can before buying — some brands have multiple product lines and only some are corn/soy‑free. (Manufacturers change recipes.)
• Watch for alternate filler-like ingredients (peas, potato, tapioca, lentils, rice) if you’re avoiding all non‑animal carbohydrates — grain‑free does not always equal “no starchy carb” or “no legumes.”
• Common ingredient names to avoid if you specifically want to exclude corn/soy: corn, maize, corn gluten meal, brewers/ground/whole corn, soybean, soy, soybean meal, soy protein isolate, soybean oil.
• If your cat has food sensitivities or medical needs, discuss diet changes with your vet before switching.

If you’d like, I can:

• Check a particular product (name/link or photo) and confirm whether that specific formula contains corn or soy.
• Narrow this to only Australian‑made brands or only wet/dry options.