MYOS Pet (myospet.com) is a veterinarian-recommended pet supplement company based in Cedar Knolls, New Jersey, dedicated to one focused mission: improving the muscle health, mobility, and vitality of dogs, cats, and horses through scientifically validated nutrition. Their entire product ecosystem is built around Fortetropin® — a proprietary bioactive compound derived from fertilized egg yolk using a patented processing method — which is clinically shown to build lean muscle mass, reduce muscle atrophy, improve mobility, and accelerate recovery from injury or surgery.

MYOS Pet is a proud member of the National Animal Supplement Council (NASC), and their products are manufactured in the USA from globally sourced ingredients. All canine products come with a 100% satisfaction guarantee — if you or your pet are not satisfied, MYOS will make it right.

What MYOS Pet Offers

Canine Muscle Formulas (Powder):

• MYOS Canine Muscle Formula — The original, bestselling formula. 100% Fortetropin® powder, single ingredient, no additives or artificial ingredients. Clinically shown to build muscle and reduce atrophy in dogs of all ages. Dose: 1 scoop for dogs up to 25 lbs, 2 scoops for 26–50 lbs. Sprinkle directly onto food daily. Available in 6.35 oz and 12.7 oz canisters
• MYOS Canine Muscle Formula Vet XL Canister (880g) — The highest-volume canister for large dogs or multi-dog households. Best price per gram and ideal for long-term daily supplementation
• MYOS Canine Muscle & Joint Formula — Combines Fortetropin® with Green Lipped Mussel, a natural source of Omega-3 fatty acids and glycosaminoglycans (GAGs) including chondroitin sulphate. Rebuilds lost cartilage and tendons, reduces joint pain and inflammation, and supports muscle and joint health simultaneously. Ideal for dogs with arthritis, hip dysplasia, or age-related mobility loss
• MYOS Vet Strength Canine Formula — The most intensive muscle recovery formula in the MYOS lineup. Fortetropin® + Branched-Chain Amino Acids (BCAAs) for accelerated muscle protein synthesis and post-surgical or post-injury recovery. Ideal for dogs recovering from orthopedic surgery, ACL repair, or severe muscle wasting
• MYOS Canine Vet Muscle Formula Plus (Eggshell Membrane) — Fortetropin® + Eggshell Membrane, which provides natural collagen, elastin, and hyaluronic acid for comprehensive musculoskeletal support. Recommended by holistic veterinarians for dogs with connective tissue issues alongside muscle weakness
• MYOS Canine Muscle Formula Sample — A trial-size sample for first-time buyers who want to test palatability and early results before committing to a full canister

Feline Muscle Formulas:

• MYOS Feline Muscle Formula — Fortetropin® powder specifically dosed for cats. Clinically shown that approximately 67% of cats on Fortetropin gained lean muscle mass, averaging +881g. Ideal for senior cats, cats with CKD (chronic kidney disease), or post-surgical feline recovery. One scoop = 1 gram ≈ ½ teaspoon
• MYOS Feline Muscle & Joint Formula with Green Lipped Mussel — Fortetropin® + Green Lipped Mussel for cats dealing with both muscle loss and joint stiffness. Particularly effective for senior cats with arthritis or reduced mobility

Canine Chews:

• MYOS Muscle & Mobility Collagen Chew — A daily soft chew combining collagen and mobility-supporting ingredients for dogs who need joint and connective tissue support in a treat format. Convenient alternative to powder for dogs who resist food toppers
• MYOS Canine Immunity Chew — Daily immune support chew formulated with natural ingredients to strengthen the immune system and support overall wellness in dogs of all ages
• MYOS Canine Probiotic Chews — Daily soft chews supporting gut microbiome balance, digestive health, and nutrient absorption. Pairs well with the Muscle Formula for holistic whole-body support

Bundles:

• MYOS 12.7oz Canister + Collagen Chew Bundle with Bandana — A curated value gift bundle combining the full-size Canine Muscle Formula canister with Collagen Chews and a branded dog bandana. A complete muscle and joint starter kit

Equine Formulas:

• MYOS Equine Muscle Formula — Fortetropin® for horses. Clinically well-tolerated at doses of 24g and 48g per day in a 2-week study with retired horses, with no adverse events. Supports muscle maintenance and recovery in performance horses, aging horses, and horses recovering from injury or stall rest
• MYOS Equine Muscle Formula Sample — A trial-size equine sample for horse owners who want to test the formula before purchasing a full canister

Who Is MYOS Pet For?

Senior dogs losing muscle mass — the most common use case for MYOS. Dogs aged 7+ naturally lose muscle through a process called sarcopenia, causing reduced mobility, difficulty rising, and loss of stamina. Fortetropin® is clinically shown to slow this process and, in many cases, reverse measurable muscle loss within 8–12 weeks.

Dogs recovering from surgery or injury — orthopedic procedures (ACL repair, TPLO, femoral head ostectomy), disc surgery (IVDD), or fracture recovery. Fortetropin® supports muscle recovery by upregulating the mTOR pathway (promoting growth), downregulating the Ubiquitin pathway (slowing degradation), and lowering myostatin levels. The Vet Strength + BCAA formula is specifically designed for this use case.

Dogs with arthritis, hip dysplasia, or joint disease who have secondary muscle wasting around affected joints. The Canine Muscle & Joint Formula addresses both dimensions simultaneously.

Dogs with degenerative muscle conditions — including muscle wasting associated with degenerative myelopathy, Cushing's disease, hypothyroidism, or cancer-related cachexia.

Senior and CKD cats who are losing lean body mass — a common and serious complication of feline chronic kidney disease. The Feline Muscle Formula is well-tolerated in cats with CKD, with stable kidney function confirmed in a 12-week supplementation study.

Performance horses and aging horses in rehabilitation or needing ongoing muscle maintenance.

Veterinarians and rehabilitation practitioners who want a clinically validated, steroid-free, natural muscle support tool for their patients — MYOS has an active Veterinary Advisory Board and is actively used in canine rehabilitation practices across the USA.

Pricing at a Glance

Use code WELCOME20 at checkout for 20% off your order. All canine products come with a 100% Satisfaction Guarantee.

Why We Recommend MYOS Pet

MYOS Pet occupies a genuinely rare position in the pet supplement market: a company whose primary ingredient is backed by peer-reviewed, published clinical research — not just marketing claims. Fortetropin® has been studied in randomized controlled trials in dogs, cats, horses, and humans. The mechanism of action is well-understood (mTOR upregulation, myostatin suppression, Ubiquitin pathway downregulation), and the results in real-world pets align with what the clinical data predicts.

For dog and cat owners dealing with muscle wasting — whether from aging, surgery, injury, or disease — MYOS Pet is the most scientifically credible natural intervention available without a prescription. Veterinarians in rehabilitation, oncology, and geriatric practice recommend it because it works at a biological level, not just anecdotally.

Find the latest MYOS Pet coupon codes and deals on this page — including the verified code WELCOME20 for 20% off your first order.