Below are premium natural dog‑care brands sold or made in Australia that explicitly advertise products with no preservatives. I note when a brand means “no artificial preservatives” vs. truly preservative‑free (e.g., raw/freeze‑dried or single‑ingredient air‑dried treats usually have no added preservatives).

• Frontier Pets — freeze‑dried, raw meals and treats (Australian-made). Freeze‑drying gives long shelf life “without any preservatives.” (frontierpets.com.au)
• ZIWI (ZIWI Peak) — air‑dried, high‑meat recipes (NZ brand widely sold in AU). Air‑dry process “locks in goodness… without artificial preservatives.” (ziwipetfood.com.au)
• K9 Natural — freeze‑dried and canned whole‑food diets (NZ brand available in AU). States no artificial additives, preservatives or fillers (freeze‑dried products don’t need added preservatives). (au.k9natural.com)
• Big Dog Pet Foods — Australian BARF/raw patties (frozen). Marketed as “no preservatives” (raw, frozen product). (petcity.com.au)
• NatureDog — Australian raw/minced frozen meals and raw treats. Explicitly states products contain “no … preservatives” (preservative‑free). (naturedog.com.au)
• SavourLife — Australian dry, raw and treats; markets ranges as “absolutely free of artificial flavours, colours or preservatives” (no artificial preservatives). (savour-life.com.au)
• Meals For Mutts — Australian dry and grain‑free lines; states “No Chemical Preservatives” and uses natural preservation (vitamin E / rosemary extract on some formulas). (mealsformutts.com.au)
• Wildkind (Wildkind Treats) — Australian single‑ingredient, air‑dried treats: “no fillers, no artificial nasties… no preservatives.”