Lactoferrin for Dogs

What this iron-binding protein does, what dog studies found, and how to compare chews, powders and colostrum

By La Petite Labs Editorial 15 min read

Woman hugging a golden retriever while holding a Hollywood Elixir box
Hollywood Elixir® Daily longevity system · adult & senior dogs Starting at $63/month 

Lactoferrin is a protein that binds iron. That matters because bacteria need iron to grow: in laboratory experiments, lactoferrin can hold some of that iron out of reach. Dogs also make their own lactoferrin, including in immune cells called neutrophils. 1 2

On a supplement label, the same name can appear in very different products—a dental chew, a powder or a colostrum blend. The differences matter. A gel placed on a dog’s gums has a different job from an ingredient swallowed with dinner, and a scoop of colostrum contains more than lactoferrin.

Lactoferrin holds iron; in laboratory conditions, that can leave less iron available for bacteria. Digestion can also cut the protein into smaller pieces, some of which have antibacterial activity in experiments. Swallowing a powder and applying a gel to gums therefore raise different questions. 2 14

Dog feeding studies have measured intestinal microbes and immune responses, while a small gum-gel experiment found improvements in selected dental measurements. 4 5 6 A useful product comparison starts with those concrete details: what preparation was used, how much lactoferrin a serving contains, and whether the finished product was tested for the result you want.

How binding iron can slow bacteria

Think of iron as a resource bacteria have to obtain. Lactoferrin can attach to iron and hold it. In one laboratory study using human lactoferrin, this slowed the growth of Staphylococcus aureus in a defined culture medium. Adding iron reversed the inhibition—a direct test of how iron availability affected bacterial growth. 2

That explains one reason the protein interests researchers. It does not make a lactoferrin supplement an iron treatment, or show that swallowing it will clear an infection in your dog.

Woman holding a Hollywood Elixir box beside a pug, a terrier and a food bowl

Dogs make lactoferrin too

Lactoferrin is part of canine biology before anyone puts it in a tub. Researchers have isolated it from dogs’ neutrophils, a type of white blood cell, and tested the protein’s iron-binding and antibacterial properties in the laboratory. 1

Woman in sportswear holding a Hollywood Elixir box beside a black-and-tan dog outdoors

Lactoferrin and colostrum are different label claims

Colostrum is the early milk produced after birth. It contains lactoferrin among its other components. Researchers measuring cow colostrum and milk found that lactoferrin concentrations varied, with generally higher amounts in early colostrum. 3

A label stating “1,000 mg bovine colostrum” therefore does not tell you that the serving supplies 1,000 mg of lactoferrin. To compare it with an isolated-lactoferrin product, you would need the actual lactoferrin amount. “Bovine” identifies the cow as the source; it does not specify the concentration.

Woman holding a Hollywood Elixir box above her forehead beside a Bernese mountain dog outdoors

What happens to a protein after it is swallowed

Digestion can change a swallowed protein. In laboratory experiments, pepsin—a stomach enzyme that cuts proteins—released antibacterial peptides from human and bovine lactoferrin. The smaller pieces retained activity against bacteria in culture. 14

So breaking up lactoferrin does not necessarily make every piece inactive. It does make oral use a different biological question from placing an intact-protein gel directly on the gums. The dog feeding studies below show what researchers measured after lactoferrin was eaten; they do not assume the whole protein arrived unchanged.

Golden retriever nuzzling a woman holding a Hollywood Elixir box on the grass beside a food bowl

What happened when healthy dogs ate lactoferrin

A 2006 feeding study tested bovine lactoferrin in healthy adult dogs over 14-day periods. Researchers measured nutrient digestion, intestinal bacteria and immune characteristics. Most measured bacterial groups did not change. Stool scores stayed near ideal across diets, and the authors reported no major effect on the health indices they assessed. 4

The useful point is that this study actually tested swallowed lactoferrin in dogs. It did not show firmer stools in dogs with diarrhea. The animals began healthy, and the results give little reason to promise an owner a visible digestive improvement.

Lactoferrin binds iron, one of the nutrients bacteria need to grow.

What changed in the beagles’ immune cells

Another feeding study followed 18 beagles through three four-week periods: a control diet, a period with different lactoferrin amounts, then a return to the control diet. Some blood immune-cell counts and responses to laboratory stimulation increased. Plasma immunoglobulins—antibody proteins in the blood—did not change. Reductions in two fecal bacterial groups were reported as tendencies. 5

The study measured immune activity; it did not establish whether the dogs went on to have fewer infections.

Overhead view of a black-and-white dog beside a food bowl and Hollywood Elixir box

The dog dental experiment used a gel on the gums

A small 2006 conference report studied eight female beagles using lactoferrin gel applied directly to the gums twice daily. The researchers compared treated areas with placebo areas within the dogs’ mouths. At the higher, 4% concentration, less fluid collected in the crevice between tooth and gum at weeks 5, 7 and 9; this fluid was one measure used to assess gum inflammation. Plaque scores were lower at week 3. The 1% gel comparisons were not statistically significant. 6

This is a reason to investigate lactoferrin in oral care, with a small study behind it. The preparation and contact with the gums are central to the finding: the experiment did not test a finished dental chew or a powder added to food.

Woman smiling beside a golden retriever, a green food bowl and a Hollywood Elixir box

Why a human gum study appears in lactoferrin claims

A larger dental trial enrolled 150 adults and compared tablets containing lactoferrin plus lactoperoxidase with placebo over 12 weeks. Among the 109 participants included in the efficacy analysis, the higher-dose combination produced a greater reduction in the gingival index—a gum-health score—than placebo. 7

That result belongs to two ingredients used together in human mouths. It helps explain interest in the combination, but it cannot identify lactoferrin’s separate contribution or establish that a dog chew will produce the same result.

Man holding a Hollywood Elixir box while sitting on an outdoor sofa with a golden retriever

For a dental chew, look for testing of the chew

The Veterinary Oral Health Council, or VOHC, reviews submitted product trial data against its standards for plaque or tartar control. It awards acceptance to specific products; it does not test the products itself or approve lactoferrin as an ingredient. 10

When comparing chews, check the exact product and the claim covered on the VOHC accepted-products list. Then check its size and use directions for your dog. A lactoferrin ingredient list and a product’s demonstrated plaque reduction answer different questions.

Brushing does a job a supplement cannot do for you

Daily brushing physically removes plaque from the teeth. It does not remove calculus, the hardened deposit commonly called tartar. AAHA’s dental guidelines also warn that brushing inflamed gums can hurt. A painful mouth needs assessment before a more determined brushing routine. 11

Chewing can remove some plaque, so a suitable chew can have a practical role. It still belongs alongside a dental plan that accounts for the gums and the parts of the mouth an owner cannot assess at home. 12

Daily brushing removes plaque; it does not remove hardened tartar.

Woman sitting with a beagle in a kitchen while holding a Hollywood Elixir box

DVM Voice: Clinical Vignette of a Common Pattern in Senior Dog Aging

Case provided by JoAnna Pendergrass, DVM

Rex, a 7-year-old Labrador Retriever, was brought in after his owner noticed he was slower to rise, hesitant on stairs, and less able to play as before. Examination showed stiffness and reduced hip mobility; radiographs confirmed degenerative joint changes.

His care required weight management, veterinary-guided pain control, nutritional support, and rehabilitation — a comprehensive plan, but one started only after visible decline appeared.

Clinical takeaway: Rex’s case reflects the value of proactive aging support: maintaining lean body condition, monitoring mobility early, and supporting cellular resilience, antioxidant defense, and healthy inflammatory balance before decline becomes obvious.

Single-case vignette. Not generalizable. Veterinary oversight is essential for pain, stiffness, or suspected joint disease.

Explore Hollywood Elixir Research →
Spotted gray dog beside a Hollywood Elixir box held in a person's hand

Lactoferricin on skin is a separate preparation

Lactoferricin is a smaller peptide derived from lactoferrin. 14 A two-week study in 38 dogs with atopic dermatitis tested a topical emulsion containing lactoferricin and verbascoside. Clinical scores fell, and the abstract reported no adverse effects; the study was open-label, and the abstract does not describe a control group. 8

Both the second ingredient and direct skin application matter. This is not evidence that an oral lactoferrin chew treats itchy skin. If a product cites the study, its preparation should be named clearly enough for you to recognize the difference.

Golden retriever nuzzling a man holding a Hollywood Elixir box beside a food bowl

Read the serving line before comparing milligrams

Suppose one label lists 50 mg of lactoferrin per two-chew serving and another lists 50 mg per capsule. One chew supplies 25 mg; one capsule supplies 50 mg. Those are different amounts even though “50 mg” appears on both labels. This is a label-reading example, not a suggested dose.

Check whether the amount refers to lactoferrin itself, a blend containing it or the weight of the whole chew. If a company lists only a combined blend weight, the lactoferrin amount remains unknown.

The company should also explain its ingredient source and product testing. Our quality and testing standards show the kind of manufacturing information to look for, separately from evidence of a health benefit.

Golden spaniel eating from a green bowl beside a Hollywood Elixir box

Work out the cost of the daily serving

If those hypothetical directions call for two chews a day, a bag of 60 chews lasts 30 days. If the bag costs $30, the daily cost is $1. Comparing the price per chew alone would miss the serving the directions call for. These are hypothetical labels and prices, not instructions for your dog.

The routine also has to work in practice: a powder left in the bowl has not all been eaten, and a chew your dog refuses is an unused purchase. Check the directions and pack size before committing to a large supply.

What safety research can tell you

A 13-week repeated-dose study in rats found no apparent treatment-related adverse effects in the clinical, laboratory and tissue assessments reported. It studied bovine lactoferrin under controlled conditions. 9

That is useful toxicology evidence, but it does not provide a safe-and-effective dose for every dog. Bring the complete product label to your veterinarian if you are considering it for a dog with an existing illness or other treatments. The relevant choice includes the other ingredients in the product, not only lactoferrin.

During an allergy diet trial, extras can spoil the test

A veterinary elimination diet is meant to control everything the dog eats so the response to that diet can be assessed. AAHA’s client instructions exclude extras such as flavored dental chews and chewable supplements unless the veterinarian directs otherwise. 13

A bovine-lactoferrin powder or a flavored chew is therefore something to clear with the team running the trial. “For skin health” on the front of the package does not make it compatible with that diet.

Woman holding a Hollywood Elixir box beside a dapple dachshund and green food bowl on a sofa

Where Hollywood Elixir fits

Lactoferrin is not an ingredient in Hollywood Elixir. La Petite Labs’ daily powder has a separate focus: healthy-aging support for adult dogs and cats. It combines NR, an NAD+ precursor, with reduced glutathione, CoQ10 and other antioxidant ingredients.

If that is the goal you are exploring, the Hollywood Elixir ingredient list shows the complete formulation, and our NAD+ for dogs guide explains the cellular-energy connection and the research behind it.

Woman cuddling a brown-and-white spaniel while holding a Hollywood Elixir box

A change in chewing deserves attention

Dropping food, eating on one side, drooling or red gums can be signs of dental disease. Bad breath also warrants attention. AAHA advises a dental examination when these signs appear. 12

If your dog starts abandoning a chew it used to enjoy, record that change and arrange an assessment.

Before you buy

For a dental purchase, check the exact product’s plaque or tartar evidence and its directions. For colostrum, find the lactoferrin amount before comparing prices with an isolated-protein product. If the intended use is a digestive or immune problem, take the complete label to the veterinarian who is assessing that problem.

A colostrum amount is the weight of a mixture, not the amount of lactoferrin inside it.

Educational content only. This material is not a substitute for veterinary advice. Always consult your veterinarian about your dog’s specific needs. These statements have not been evaluated by the Food and Drug Administration. Products mentioned are not intended to diagnose, treat, cure, or prevent any disease.

Glossary

Lactoferrin: An iron-binding protein found in milk and in immune cells, including canine neutrophils.

Bovine: Derived from cattle.

Colostrum: The early mammary secretion after birth; it contains lactoferrin among other components.

Neutrophil: A type of white blood cell involved in immune defense.

Lactoferricin: A peptide derived from lactoferrin; it is a different preparation from the intact protein.

Lactoperoxidase: A separate enzyme combined with lactoferrin in some oral-care research.

Plaque: The bacterial film that accumulates on teeth.

Calculus: Hardened dental plaque, also called tartar.

Gingival index: A scoring measure used to assess the condition of the gums.

Placebo: A comparison preparation that does not contain the ingredient being tested.

Related Reading

Aging & Senior Dog Guidance
• Dog Age Calculator
• Dog Lifespan by Breed
• Dog Dementia
• Lethargy in Dogs
• My Dog Won't Eat
• Dog Pacing At Night
• Dog Licking Paws
• Can Dogs Dehydrate

Healthy Aging Support
• NAD+ for Dogs
• NMN for Dogs
• Antioxidants Supplements for Dogs
• Best Senior Dog Supplements & Vitamins
• Rapamycin for Dogs

References

Numbered references identify the sources used for specific claims. Read the study design, species and evidence boundaries alongside each finding.

  1. M N Berlov, E S Korableva, et al. Lactoferrin from canine neutrophils: isolation and physicochemical and antimicrobial properties. Biochemistry (Moscow) 72(4):445–451 · 2007· DOI 10.1134/S0006297907040128Study design/context: Canine neutrophil protein isolated and tested biochemically and against bacterial cultures.Species/context: dog, bacterial cultureEvidence boundary: Researchers characterized lactoferrin isolated from canine immune cells; they did not test a supplement fed to dogs.↩ 1 · ↩ 2
  2. Antonio Aguila, Ana G Herrera, et al. Bacteriostatic activity of human lactoferrin against Staphylococcus aureus is a function of its iron-binding properties and is not influenced by antibiotic resistance. FEMS Immunology & Medical Microbiology 31(2):145–152 · 2001· DOI 10.1111/j.1574-695X.2001.tb00511.xStudy design/context: Human colostral lactoferrin; laboratory strains and 42 human clinical S. aureus isolates in culture.Species/context: bacterial cultureEvidence boundary: The experiment tested bacterial growth and iron availability in laboratory culture, rather than treatment of canine infection.↩ 1 · ↩ 2 · ↩ 3
  3. Rivca L Valk-Weeber, Talitha Eshuis-de Ruiter, et al. Dynamic Temporal Variations in Bovine Lactoferrin Glycan Structures. Journal of Agricultural and Food Chemistry 68(2):549–560 · 2020· DOI 10.1021/acs.jafc.9b06762Study design/context: Milk and colostrum from eight cows over two lactation cycles; lactoferrin quantified by ELISA and isolated for glycan analysis.Species/context: cattleEvidence boundary: Researchers measured lactoferrin in cow colostrum and milk, rather than supplement outcomes in dogs.↩
  4. Lynda L Pope, Elizabeth A Flickinger, et al. Effects of lactoferrin supplementation on ileal and total tract nutrient digestibility, gastrointestinal microbial populations, and immune characteristics of ileal cannulated, healthy, adult dogs. Archives of Animal Nutrition 60(1):10–22 · 2006· DOI 10.1080/17450390500353390Study design/context: Healthy adult ileal-cannulated dogs; replicated 3×3 Latin square with 14-day periods, bovine milk lactoferrin 0/60/120 mg/day. Abstract does not state dog count.Species/context: dogEvidence boundary: This feeding study assessed healthy adult dogs, rather than treating dogs with diarrhea.↩ 1 · ↩ 2
  5. Petra Hellweg, Stephanie Krammer-Lukas, et al. Effects of bovine lactoferrin on the immune system and the intestinal microflora of adult dogs. Archives of Animal Nutrition 62(2):152–161 · 2008· DOI 10.1080/17450390801892575Study design/context: 18 beagles; three four-week periods. Following control diet, six dogs per group received 0/120/1800 mg bovine lactoferrin per kg dry diet; then control diet again.Species/context: dogEvidence boundary: The study measured selected immune and intestinal responses in eighteen beagles, rather than subsequent infection rates.↩ 1 · ↩ 2
  6. Daisuke Sekiya, Tomoji Ono, et al. Effect of bovine Lactoferrin on spontaneous gingival inflammation in female beagle dogs. Program and Abstracts of Annual Meeting of the Japanese Society of Periodontology 2006s:82, C-31 · 2006· DOI 10.14833/amjsp.2006s.0.82.0Study design/context: Eight female 15-month beagles, divided between 1% and 4% bovine-lactoferrin gel groups, with placebo sites within each mouth. Gel applied twice daily for nine weeks after brushing stopped.Species/context: dogEvidence boundary: This small conference report described gel applied directly to dogs’ gums, with findings at selected time points.↩ 1 · ↩ 2
  7. Manabu Nakano, Akihiro Yoshida, et al. Effect of tablets containing lactoferrin and lactoperoxidase on gingival health in adults: A randomized, double-blind, placebo-controlled clinical trial. Journal of Periodontal Research 54(6):702–708 · 2019· DOI 10.1111/jre.12679Study design/context: 150 healthy human adults randomized; 109 in efficacy analysis; double-blind, 12 weeks. Daily tablets: LF60 mg + LPO7.8 mg; LF20 mg + LPO2.6 mg; or placebo. Recorded research exposures, not dog doses.Species/context: humanEvidence boundary: The trial tested a combined lactoferrin and lactoperoxidase tablet in humans, so it cannot identify lactoferrin’s separate contribution.↩
  8. Elena Biasibetti, Natascia Bruni, et al. Lactoferricin/verbascoside topical emulsion: a possible alternative treatment for atopic dermatitis in dogs. Natural Product Research 32(17):2107–2110 · 2018· DOI 10.1080/14786419.2017.1365066Study design/context: Open-label, 2 weeks; 38 dogs with atopic dermatitis and secondary bacterial/yeast overgrowth. No control arm described in abstract. Topical emulsion combining lactoferricin and verbascoside.Species/context: dogEvidence boundary: The canine skin study tested a topical preparation containing both lactoferricin and verbascoside, rather than swallowed lactoferrin.↩
  9. K Yamauchi, T Toida, et al. 13-Week oral repeated administration toxicity study of bovine lactoferrin in rats. Food and Chemical Toxicology 38(6):503–512 · 2000· DOI 10.1016/s0278-6915(00)00036-3Study design/context: 13-week repeated-dose toxicology in rats; 12 males and 12 females per dose group. Oral bovine LF at 200, 600 or 2000 mg/kg/day; research exposure only.Species/context: ratEvidence boundary: This thirteen-week toxicology study was conducted in rats and does not establish a canine dose.↩
  10. Veterinary Oral Health Council. About the VOHC. Veterinary Oral Health Council · n.d.Evidence boundary: These veterinary acceptance criteria apply to specific products and their plaque or tartar findings.↩
  11. American Animal Hospital Association. Recommending home oral hygiene and products. American Animal Hospital Association · 2019Evidence boundary: The guideline addresses veterinary dental care, including daily brushing, rather than lactoferrin efficacy.↩
  12. American Animal Hospital Association. Dog & cat dental disease: Signs, professional cleanings, anesthesia, and home care. American Animal Hospital Association · 2024Evidence boundary: The handout explains dental concerns and examination; symptoms alone do not establish a diagnosis.↩ 1 · ↩ 2
  13. Andrew Simpson, DVM, MS, DACVD; American Animal Hospital Association. Elimination Diet Trial — English Version, in Management of Allergic Skin Diseases in Dogs and Cats Toolkit. Andrew Simpson, DVM, MS, DACVD; American Animal Hospital Association · n.d.Evidence boundary: The guidance explains how to keep food trials controlled, rather than establishing a lactoferrin benefit.↩
  14. W Bellamy, M Takase, et al. Identification of the bactericidal domain of lactoferrin. Biochimica et Biophysica Acta 1121(1–2):130–136 · 1992· DOI 10.1016/0167-4838(92)90346-FStudy design/context: Pepsin cleavage of human and bovine lactoferrin, peptide isolation/sequencing and bacterial-culture assays.Species/context: bacterial cultureEvidence boundary: The laboratory research tested antibacterial peptides released by digesting lactoferrin, rather than delivery from a finished dog supplement.↩ 1 · ↩ 2 · ↩ 3

FAQ

What does lactoferrin do in a dog’s gut?

Researchers have fed lactoferrin to dogs and measured digestion, intestinal microbes and immune responses. In one study of healthy adult dogs, most measured bacterial groups did not change and stool scores remained near ideal across diets. That study did not test whether lactoferrin treats diarrhea.

Is lactoferrin safe for most dogs?

Safety has been studied, but the evidence does not supply a dose that is right for every dog. A 13-week toxicology study found no apparent treatment-related adverse findings in rats. The dog feeding studies assessed particular preparations under particular conditions. If your dog has an illness, takes medicines or follows a prescribed diet, check the complete product label with the veterinary team before adding it.

What side effects should owners watch for with lactoferrin?

Pay attention to the whole product, including its flavors and other ingredients. If your dog develops vomiting, diarrhea, reduced appetite or another concerning change after starting it, stop the new supplement and contact your veterinarian with the label and the timing. The available studies do not tell us how often these problems occur in pet dogs taking commercial lactoferrin products.

How long does it take to see results from lactoferrin?

The research does not establish a general number of weeks in which a dog should show results from lactoferrin. Feeding studies and the small gum-gel experiment measured different things, using different preparations. If your veterinarian recommends a product, agree on the specific outcome and review date rather than expecting fewer itch episodes, cleaner ears or firmer stools on a fixed calendar.

What’s the difference between lactoferrin and lactoferricin?

Lactoferricin is a peptide derived from lactoferrin. A study in dogs with atopic dermatitis tested a topical emulsion combining lactoferricin with verbascoside; it did not test swallowed lactoferrin. The abstract reports improved clinical scores. Because the emulsion combined two ingredients, the reported improvement cannot identify either ingredient’s separate contribution.

How do owners choose a quality lactoferrin supplement?

Look for the source and amount of lactoferrin per serving, not just a blend weight. Colostrum contains lactoferrin, but the weight of colostrum does not tell you the amount of lactoferrin inside it. Ask about storage and product testing. For a dental chew, check evidence for that exact product and whether any VOHC acceptance concerns plaque, tartar or both.

When should a veterinarian be called instead of supplementing?

For a dental concern, signs such as dropping food, chewing on one side, drooling, red gums or bad breath are reasons to arrange a dental examination. A change in how your dog eats should be assessed before you choose a new chew. A supplement cannot tell you why the mouth is uncomfortable.

Is there dog-specific research on lactoferrin and immunity?

Yes. In one feeding study of 18 beagles, researchers found changes in selected immune-cell counts and laboratory responses, while plasma immunoglobulins—antibody proteins in the blood—did not change. These are findings about immune activity, not proof that supplemented dogs avoided more infections. They are more directly relevant to an oral product than laboratory tests of isolated lactoferrin, but they still do not establish a general benefit for every dog.

Dalmatian looking toward a Hollywood Elixir box held in a person's hand

Discover LPL-01: How This Fits Into a Larger Canine Longevity System

Aging in dogs is not driven by a single pathway. It’s the result of interacting biological systems—energy metabolism, oxidative stress, immune signaling, and structural integrity—changing over time.

This article explores one piece of that puzzle. If you want to understand how these pieces connect—and what actually moves the needle—you need to zoom out.

Start with the underlying science:

Keep exploring

What would you like to understand next?

Search practical guides about healthy aging, cellular energy, ingredients, and daily support for dogs.