Short answer — many. Below are commonly available brands (Australia-focused) that make joint/mobility formulas for dogs, grouped by type:

Prescription veterinary diets (for dogs with diagnosed joint disease — discuss with your vet)

• Hill’s Prescription Diet j/d (and Metabolic + j/d options). Clinically formulated to improve mobility and contains omega‑3s, glucosamine/chondroitin and controlled calories. (hillspet.com)
• Royal Canin Veterinary Mobility C2P+ (vet-exclusive diet formulated to support joints and mobility). (royalcanin.com)
• Purina Pro Plan Veterinary Diets — JM (Joint Mobility) formula. Designed to support joint health with higher omega‑3s and glucosamine sources. (shop.vivapets.com)

Over-the-counter (OTC) supplements and chewables (daily joint support, widely sold through vets/retailers)

• Nutramax (Cosequin, Dasuquin) — long-established vet-recommended joint supplement lines (glucosamine, chondroitin, ASU, MSM, etc.). (dasuquin.com)
• VetriScience (GlycoFlex / Healthy Hip & Joint and related products) — popular veterinarian/formulator brands of chews and tablets. (blog.vetriscience.com)
• Blackmores PAW (PAW OsteoCare, OsteoAdvanced) — Australian brand with glucosamine/chondroitin/MSM and green‑lipped mussel options. (blackmores.com.au)
• Zesty Paws — widely available soft chews with glucosamine, chondroitin and MSM (sold in Australia via retailers). (vitamingrocer.com.au)
• NaturVet and other international supplement brands — offer layered-strength glucosamine/MSM/chondroitin/hyaluronic acid and green‑lipped mussel products (available via Australian retailers). (pawsplanetshop.com)

What to look for in a good joint formula

• Key ingredients: glucosamine (HCl or sulfate), chondroitin, omega‑3 EPA/DHA, MSM, hyaluronic acid, green‑lipped mussel (Perna), and sometimes turmeric/curcumin or avocado/soy unsaponifiables (ASU).
• Formulation & dose: therapeutic benefit depends on ingredient type and dose — many products use a loading dose then maintenance dose.
• Evidence & safety: some prescription diets have clinical trials showing improved mobility; supplement evidence varies by product. Always check product labels and manufacturer claims.

Practical notes

• Prescription joint diets (Hill’s, Royal Canin, Purina JM) are usually recommended/monitored by a vet and may require a prescription. (hillspet.com)
• Supplements can interact with medications and aren’t appropriate for every dog (e.g., dogs with certain allergies, pregnant/nursing dogs, or those on other drugs).
• Weight management and tailored exercise are often as important as supplements for mobility.

If you want, I can:

• Narrow this to products stocked in your local area (city/postcode in Australia), or
• Compare 2–3 specific products (ingredients, typical doses, and pros/cons).