✓Reviewed by Ann Pruitt, InfoHorse.com·Updated May 2026
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K9 Transfer Factor™ by K9 Medicinals Transfer Factors help create antibodies. Antibodies are like little soldiers that scour the body seeking and destroying damaged cells!
What sets K9Medicinals.com Apart From Competitors?
We are a family business, who started selling these products after our own dog was diagnosed with cancer and given two weeks to live. K9Immunity extended our dog’s life by two years. We are passionate about helping others going through this trauma and want to keep healthy dogs well so no family has to go through what we did. All of our products are made in the U.S.A. and all of the ingredients are made in the U.S.A. as well. They are formulated in FDA certified laboratories to human grade standards. They are safe, organic, natural and have no known interactions with any other supplement or medication. They are safe for even pregnant or nursing canine mothers. Some other companies advertise their products are made in the U.S.A., but the ingredients come from other countries who have no safety standards. We have a full money back guarantee and a wonderful support system for our customers and their canine family members.
K9 Transfer Factor™
Transfer factors are proteins your dog naturally produces. These proteins join with other immune-specific molecules to create antibodies. Antibodies are like little soldiers that scour the body seeking and destroying damaged cells. But when your dog has cancer, he’s can’t produce the amount of transfer factors he needs. And without enough transfer factors, he can’t create the antibodies he needs for stronger health. That’s why we created K9Transfer Factors™. Transfer factor supplements alone aren’t known to have any effect on dogs with cancer. But if your dog is taking K9 Immunity™, we Highly recommended using K9 Transfer Factor™ in conjunction.
That’s because K9 Transfer Factor™ is designed to bond with the immune-modulating compounds in K9 Immunity™. By doing so, it increases their absorption and bioavailability. This significantly enhances K9 Immunity’s™ effectiveness. In turn, it increases your dog’s chances for improvement
There are many brands of transfer factors available in health food stores. Both human grade and canine grade work with K9 Immunity™. However, our manufacturers invested over three years researching with a major veterinary nutrition company to develop the ultimate transfer factor for maximum effectiveness. And K9 Transfer Factor™ comes in an easy to chew, liver flavored wafer dogs love.
Guaranteed safe, natural and effective:
• Safe for all breeds and sizes
• Safe to use with other cancer treatments
• Made with 100% USDA Certified Organic materials
• Manufactured in a FDA registered facility
• 100% non GMO
• Created according to the highest pharmaceutical standards
• Absolutely no binders, fillers, flow enhancers or time release agents
• Have no known side-effects
• 100% non-toxic (no risk of overdosing)
• Backed by our full satisfaction guarantee
• Made in the USA to human grade standards
K9 Immunity™
K9 Immunity™strengthens and balances your dog’s immune system so the body recognizes and destroys damaged cells. This improves their body’s ability to overcome illness and helps protect them against future illness.
Your dog’s immune system works in two ways:
Keeps existing cells healthy as they replicate
Rids damaged cells (like cancer cells) before they can multiply
Once your dog’s immune system strengthens, it may also help them:
Increase response to cancer treatment
Speed up recovery
Reduce side-effects from other cancer therapies
Prevent a serious future illness/relapse
Improve quality of life
Extend their time with you
K9 Immunity Plus™
K9 Immunity Plus™ is an intense immune-boosting daily supplement designed to provide maximum support for dogs with cancer. And it comes in a convenient, easy to administer form.
This formula includes all of the ingredients in our successful K9 Immunity™. Then we intensified it by adding:
Transfer Factors Increases the formula’s effectiveness and results. The immune-active polysaccharides in K9 Immunity™ work by bonding with your dog’s immune proteins. Transfer factors are needed for this bonding to occur.The added transfer factors increase the number of naturally-occurring bonds. In turn, this activates a greater number of immune cells for better results.
Omega 3 Essential Fatty Acids Omega 3 essential fatty acids are well-studied to help shrink tumors, lower inflammation and provide a host of other health benefit s. Making it more pleasant for your dog, K9 Immunity Plus™ comes in easy to chew wafers with natural liver and fish flavors dogs love.
What Symptoms Should I Look For To Alert Me To A Poor Immune System?
Boosting the immune system for proper working biochemical interactions is important to your dog’s wellness. The immune system is constantly protecting the body from parasites, bacterial, fungal, or virus-infected cells. Boosting your dog’s immune system will help his body overwhelm bacteria, destroy toxins, or kill viruses. Infected cells produce interferon and other cytokines, which can signal contiguous uninfected cells to intensify their defenses, enabling them to damage invaders.
In a weak immune system, bacteria, viruses, micro organisms, and toxins can pass the immune defending cells, and generate disorders. A lowered immune system function in dogs results in acute or chronic fungi, allergies, yeast infections, eczema, demodectic mange, food allergy, arthritis, ear infections, slowly healing wounds, or fertility disorders.
What If My Dog Is Healthy, Can These Products Still Help?
YES!! Absolutely, they can help. Our goal is to help your healthy dog stay healthy and your sick dog heal and have a good quality of life and extended years with your family.
Order Transfer Factors For Your Dogs Immune Health Today!
Make sure your dog has a healthy immune system to fight off disease, infection and to help support general well being and joy in their every day lives by using products from K9Medicinals. For more information about our immunity line of products, please call us today! K9 Immunity 90-count bottle of organic medicinal mushroom immune supplement for dogs by K9 Medicinals, front viewWhat are transfer factors, and why do dogs need them? Transfer factors are tiny "messenger" molecules naturally found in colostrum that pass immune knowledge from cell to cell, teaching a dog's immune system to recognize and respond to threats without prior exposure. Unlike a simple immune "booster," they modulate the immune system in both directions, ramping it up when a pathogen is detected and calming it when it overreacts. In the K9 Medicinals line, K9 Transfer Factor is the companion product that increases the bioavailability and effectiveness of K9 Immunity, helping the mushroom-derived compounds bond with the dog's own immune proteins. The result is a more balanced, better-coordinated immune response rather than blunt stimulation.
K9 Immunity supplement bottle left-side label showing Immune Assist mushroom complex by K9 MedicinalsWho makes K9 Medicinals, and where did it begin? K9 Medicinals is a small, family-owned business founded by Dorla Salling after her Basset Hound, Rosie, was diagnosed in 2005 with tumors on her lungs, liver, and stomach and given two weeks to live. Searching for any way to help, Dorla found an all-natural organic mushroom supplement; within the first day, Rosie perked up, and she went on to live to age 13. That experience became the company's mission, and Dorla still personally answers customers at (888) 366-3641 and. It is the rare supplement brand born from a real dog at a real kitchen table rather than a boardroom.
K9 Immunity supplement bottle right-side label with dosing information by K9 MedicinalsWhat is inside the formula, and who manufactures it? The active ingredients combine colostrum-derived transfer factors with the Immune Assist Micron complex, an extract drawn from six certified-organic medicinal mushrooms: Agaricus blazei, Cordyceps sinensis, Trametes versicolor (Turkey Tail), Ganoderma lucidum (Reishi), Grifola frondosa (Maitake), and Lentinula edodes (Shiitake). That mushroom complex delivers over 200 naturally occurring immune-active polysaccharides and beta-glucans, standardized to a minimum of 80 percent active content. The mushrooms are produced by Aloha Medicinals Inc. using DNA-verified strains under strict GMP standards and FDA recommendations, and the ingredients carry USDA and EU organic certification and are GMO-free.
K9 Immunity Plus chewable immune-support wafers for dogs by K9 Medicinals product photo
How does it work alongside K9 Immunity?
K9 Transfer Factor is designed to be given together with K9 Immunity, the brand's flagship supplement billed as the number-one veterinarian-recommended immune supplement for dogs in North America. The mushroom beta-glucans in K9 Immunity prime the immune system, while the transfer factors sharpen its targeting and improve uptake, so the two work as a coordinated pair. For owners who prefer one product, the company also offers K9 Immunity Plus, a chewable wafer that folds the base mushroom formula, transfer factors, and Omega-3 essential fatty acids into a single daily dose at a price below buying each component separately. Each approach centers on immune modulation, which means supporting balance rather than simply over-stimulating an already stressed system.
Which dogs is this made for?
K9 Medicinals supplements are formulated for dogs facing cancer, tumors, autoimmune challenges, or any condition that taxes the immune system, as well as senior and recovering dogs who need extra support. Dosing follows body weight: in the transfer factor line, dogs under roughly 11 kg take one capsule daily and larger dogs take two. The K9 Immunity dosing scales from one 500 mg capsule per 4.5 kg of body weight, so a small dog may get one capsule while a giant breed receives twelve. The supplements are intended as a complement to veterinary care, not a replacement for it, and the company is transparent that individual results will vary.
How do you buy it, and what does it cost? K9 Medicinals sells directly at k9medicinals.com, with free shipping on orders over $60 and next-business-day replies between 10am and 12pm PST. Current catalog pricing includes K9 Immunity at $28.95 for a 90-count bottle (or $55.99 for a two-pack), K9 Immunity Plus wafers at $47.95 for medium dogs (30 to 70 lbs) and $59.95 for large dogs (over 70 lbs), K9 FullFlex joint wafers at $45.95, and Comfort Factor at $39.99. Because availability on individual SKUs like K9 Transfer Factor can change, owners are encouraged to call (888) 366-3641 to confirm current stock and get help matching a product to their dog's weight and condition.
Who is K9 Medicinals — and what's the founder story?
Per K9 Medicinals: a family business that started selling these products after their own dog was diagnosed with cancer and given two weeks to live. Per the company: K9Immunity extended their dog's life by two years. Passionate about helping others going through this trauma, plus keeping healthy dogs well so no family has to go through what they did.
What's K9Medicinals' production posture?
Per K9 Medicinals: all products are made in the U.S.A.; all ingredients also made in the U.S.A. Formulated in FDA-certified laboratories to human-grade standards. Per the company: safe, organic, natural, with no known interactions with any other supplement or medication. Safe for pregnant or nursing canine mothers.
Differentiation: per K9: "Some other companies advertise their products are made in the U.S.A., but the ingredients come from other countries who have no safety standards."
What is K9 Transfer Factor™?
Per K9 Medicinals: Transfer factors are proteins your dog naturally produces. These proteins join with other immune-specific molecules to create antibodies. Per the company: "Antibodies are like little soldiers that scour the body seeking and destroying damaged cells."
When a dog has cancer, the dog can't produce the amount of transfer factors needed for stronger health. K9 Transfer Factor™ supplies what the dog can't produce.
How does K9 Transfer Factor work with K9 Immunity?
Per K9 Medicinals: if your dog is taking K9 Immunity™, the company HIGHLY recommends using K9 Transfer Factor™ in conjunction. Per the company: "K9 Transfer Factor™ is designed to bond with the immune-modulating compounds in K9 Immunity™. By doing so, it increases their absorption and bioavailability. This significantly enhances K9 Immunity's effectiveness." Increases the dog's chances for improvement.
What's the K9 Medicinals guarantee?
Per K9 Medicinals: full money-back guarantee and a wonderful support system for customers and their canine family members.
How do I order?
Per K9 Medicinals: Phone 1 (888) 366-3641, email [email protected], website http://www.k9medicinals.com. Pricing as quoted is subject to change.
What is K9 Transfer Factor and what does it do?
K9 Transfer Factor is a supplement of colostrum-derived 'messenger' molecules that transmit immune-recognition information from cell to cell. It teaches a dog's immune system to identify pathogens and damaged cells without prior exposure, then helps balance the immune response, enhancing it when needed and calming it when it overreacts. In the K9 Medicinals system it is the companion product that boosts the effectiveness and bioavailability of K9 Immunity.
Who founded K9 Medicinals?
K9 Medicinals was founded by Dorla Salling, who runs it as a small family business. She started it after her Basset Hound, Rosie, was diagnosed in 2005 with tumors on her lungs, liver, and stomach and given just two weeks to live. After Dorla found an all-natural mushroom supplement and saw Rosie improve within a day, she made it her mission to share what she learned with other dog owners.
What happened to Rosie, the dog behind the company?
Rosie was given two weeks to live, but after starting the mushroom-based immune supplement she perked up within the first day and went on to live to the age of 13. Her recovery is the origin story of K9 Medicinals and the reason the company focuses on dogs with cancer and weakened immune systems. The brand was built around her experience rather than around marketing.
What are the active ingredients in the formula?
The formula combines colostrum-based transfer factors with the Immune Assist Micron complex, an extract from six certified-organic medicinal mushrooms: Agaricus blazei, Cordyceps sinensis, Trametes versicolor (Turkey Tail), Ganoderma lucidum (Reishi), Grifola frondosa (Maitake), and Lentinula edodes (Shiitake). Together the mushrooms deliver over 200 naturally occurring immune-active polysaccharides and beta-glucans.
Who manufactures the mushroom complex?
The medicinal mushroom complex is produced by Aloha Medicinals Inc. using DNA-verified mushroom strains and a proprietary fermentation process. It is made to strict GMP standards and FDA recommendations, and the ingredients carry USDA and EU organic certification and are GMO-free. The K9 Immunity formula is standardized to a minimum of 80 percent polysaccharides and beta-glucans.
How is K9 Transfer Factor different from K9 Immunity?
K9 Immunity is the base mushroom supplement that primes and supports the immune system, while K9 Transfer Factor adds colostrum messenger molecules that sharpen the immune system's targeting and help the mushroom compounds bond with the dog's own immune proteins. They are designed to be given together as a pair. K9 Immunity Plus combines both, along with Omega-3s, into a single chewable wafer.
What is K9 Immunity Plus and is it cheaper?
K9 Immunity Plus is a chewable wafer that folds three products into one: the base K9 Immunity mushroom formula, added transfer factors, and Omega-3 essential fatty acids known to help lower inflammation. The company notes it costs less than buying each component separately. It is priced at $47.95 for medium dogs (30 to 70 lbs) and $59.95 for large dogs (over 70 lbs).
How much does K9 Immunity cost?
K9 Immunity is priced at $28.95 for a 90-count bottle, or $55.99 for a two-pack, directly from k9medicinals.com. The brand describes it as the number-one veterinarian-recommended immune supplement for dogs in North America. Free shipping is offered on orders over $60.
How do I dose these supplements for my dog?
Dosing is based on body weight. For K9 Transfer Factor, dogs under roughly 11 kg take one capsule daily and dogs over 11 kg take two. For K9 Immunity, the rule is one 500 mg capsule per 4.5 kg of body weight per day, so a small dog might take one capsule while a very large dog could take up to twelve. K9 Immunity Plus wafers are dosed at one wafer for small dogs under 30 lbs, two for medium dogs, and three for large dogs.
Which dogs are these products meant for?
They are formulated for dogs facing cancer, tumors, autoimmune conditions, or other challenges that stress the immune system, as well as senior and recovering dogs needing extra support. The supplements work through immune modulation, meaning they aim to balance the immune system rather than simply overstimulate it. They can also be given to healthy dogs as a daily immune supplement.
Are the ingredients organic and made in the USA?
Yes. The mushroom ingredients are USDA and EU certified organic and GMO-free, produced by Aloha Medicinals Inc. under GMP standards and FDA recommendations. The brand emphasizes all-natural, organic sourcing throughout its product line. Owners concerned about purity can call the company directly for sourcing details.
How do beta-glucans and polysaccharides help a dog's immune system?
Beta-glucans and polysaccharides from medicinal mushrooms are well-studied compounds that activate immune cells and help regulate immune response. The K9 Immunity formula contains over 200 of these naturally occurring immune-active compounds, standardized to at least 80 percent active content. They support cellular balance and provide antioxidant and adaptogenic action rather than crude stimulation.
Will these supplements cure my dog's cancer?
No. K9 Medicinals supplements are immune-support products intended to complement veterinary care, not replace it, and they are not marketed as a cure. The company is transparent that individual results will vary. They are best used alongside your veterinarian's treatment plan to support immune balance and quality of life.
How do I contact K9 Medicinals?
You can reach the company by phone at (888) 366-3641 or by email at [email protected]. Because it is a small family business, replies typically come the next business day between 10am and 12pm PST. Founder Dorla often handles customer questions personally.
Where do I buy K9 Medicinals products and is shipping free?
Products are sold directly at k9medicinals.com. Free shipping is offered on orders over $60. Because availability on individual SKUs such as K9 Transfer Factor can change, it is worth calling (888) 366-3641 to confirm current stock and get help choosing the right product for your dog's weight and condition.
What other products does K9 Medicinals offer?
Beyond the immune line, K9 Medicinals offers K9 FullFlex, a joint-support wafer with glucosamine, chondroitin, and green-lipped mussel priced at $45.95, and Comfort Factor, a $39.99 joint and seasonal-allergy supplement made with turmeric and systemic enzymes. These products let owners address joint comfort and inflammation alongside immune support. All are sold through the same store.
Why give transfer factors instead of just a regular immune booster?
A typical immune booster simply stimulates the immune system, which can be counterproductive in dogs whose immune systems are already overreacting. Transfer factors instead modulate the response, teaching the immune system what to target and helping it calm down when appropriate. This balanced approach is why K9 Medicinals pairs transfer factors with its mushroom formula rather than relying on stimulation alone.
