Chronic skin disease in pets—commonly dismissed as seasonal allergies—frequently reflects deeper systemic imbalances involving adrenal function, toxin burden, immune dysregulation, gut integrity, and microbiome health.1 Treating these cases with corticosteroids or antihistamines alone is the equivalent of turning off a smoke detector rather than addressing the fire. This article details a comprehensive, regenerative approach that goes beyond symptom suppression to address root causes and support lasting resolution. Understanding the pathophysiology of chronic skin disease Chronic skin disease is rarely an isolated condition; it is often a cutaneous expression of broader systemic dysfunction. Three primary pathophysiological axes are worth examining: the adrenal-endocrine axis, the gut-skin axis, and the toxic burden axis. 1) The adrenal-endocrine axis Endocrine disorders are among the primary contributors to chronic dermatological presentations. Growing numbers of animals are suffering from allergies—not only to dust and pollen, but to foods, toxic mold, household chemicals, and other environmental substances. While avoidance strategies offer some relief, modern nutritional science now provides deeper insights into the root causes of allergic responses. When underlying biochemical imbalances are corrected, the body is better equipped, avoidance becomes less critical, and overall health improves. The goal of corrective therapy is to identify why the body cannot adequately cope with stress and address the fundamental problem. A 2017 study in the Journal of the American Holistic Veterinary Medical Association (JAHVMA) by Ava Frick, DVM, CAC, FAIS, revealed 94 percent of dogs had high Na to K ratios with low Ca and Mg levels, indicative of inflammation.2 Adrenal insufficiency is a primary driver of allergies and can be identified through hair tissue mineral analysis (HTMA). The adrenal glands depend on vitamins A, C, D, and E, along with manganese, copper, pantothenic acid, and specific amino acids to function optimally. Deficiencies in these nutrients—or the presence of toxic heavy metals—impair adrenal hormone synthesis and secretion. When the sympathetic nervous system becomes exhausted from chronic stress, pituitary stimulation of adrenal function also declines, compounding the problem.3 Histamine, copper, and mineral imbalance High histamine levels significantly increase the likelihood of allergic reactions. In fast oxidizers, calcium and magnesium deficiencies increase cell membrane permeability, allowing excess histamine to flood surrounding tissues. Zinc deficiency further worsens this by triggering histamine release. Correcting these imbalances with targeted calcium, magnesium, zinc, and bioflavonoid support can meaningfully reduce allergic reactivity. Often, a food allergy can be traced to the high copper content of certain foods, such as wheat, corn, and soybeans, which are commonly found in commercial diets. Excess copper depletes vitamin C, folic acid, and zinc, impairing both pituitary and adrenal function. It also compromises liver detoxification, contributing to food allergies. Importantly, copper imbalance is typically undetectable on standard blood panels but can be identified through HTMA.3 Figure 1. Courtesy of Maya Arthur The role of Vitamin D in chronic skin disease and allergies Vitamin D plays an important role in immune regulation, skin barrier health, and inflammatory balance. Deficiency may contribute to allergic disease, impaired skin healing, microbiome disruption, and increased inflammatory responses. Optimizing vitamin D levels may help improve immune tolerance, reduce allergic reactivity, and support healthier skin.17 2) The gut-skin axis Emerging research has demonstrated the powerful influence the gut microbiome has on skin health. The gut-skin axis operates through endocrine, immune, and nervous system pathways, meaning microbial disruptions in the gastrointestinal tract can manifest directly as dermatological disease.4 A 2025 study published in Veterinary Dermatology found dogs with atopic dermatitis had significantly lower fecal short-chain fatty acid (SCFA) concentrations compared to healthy dogs, clearly demonstrating the gut-metabolite-skin link.5 SCFAs support host energy metabolism, create an acidic intestinal environment that inhibits pathogen colonization, and reinforce mucosal integrity—collectively strengthening the gut’s immune defense capacity.5 When gut microbial diversity is reduced—a state known as dysbiosis—intestinal permeability occurs as tight junctions between intestinal epithelial cells weaken, enabling lipopolysaccharides (LPS) from gram-negative bacteria to leak into the bloodstream, triggering low-grade systemic inflammation that compromises the skin barrier.6 A 2025 peer-reviewed study published in BMC Microbiology 2025 confirmed dogs with canine atopic dermatitis (cAD) exhibit significantly lower gut microbial diversity and imbalanced microbiome profiles compared to healthy controls.7 Further, atopic dogs showed increased intestinal biomarkers of epithelial damage, suggesting a causative—not merely correlative—relationship.8 Figure 2. Illustration demonstrating immune components of the small intestine. Source: MDPI Figure 3. Illustration demonstrating what happens with tight junctions when the immune system is challenged. Source: Mucosal Immunology 2) Toxin burden and mineral imbalance Environmental toxins, heavy metals, and chronic nutritional imbalances or bio-unavailability represent an often-overlooked dimension of chronic skin disease. Minerals play essential roles in enzyme function, hormone synthesis, and cellular activity. When key minerals such as zinc, magnesium, or selenium are depleted, or when toxic metals such as lead, mercury, or aluminum accumulate, the resulting metabolic disruption can contribute to persistent inflammation and poor skin barrier integrity.3,9 These imbalances are often invisible to routine bloodwork, which reflects only current circulating levels kept in narrow margins rather than long-term tissue accumulation. Zinc is of particular importance to skin health, given the skin’s continuous cell turnover and the constant demand for new cells to replace those lost through desquamation. The inorganic zinc sources commonly used in highly processed commercial kibble, such as zinc oxide and zinc sulfate, are significantly less bioavailable than organic forms, such as zinc proteinate.10 Diagnostic approaches for getting to root cause Effective diagnosis must address the underlying biological systems, not simply document surface-level signs. Several tools merit consideration in a root-cause workup. Hair tissue mineral analysis (HTMA) Unlike blood tests that capture a single point in time, hair tissue mineral analysis (HTMA) reflects mineral accumulation and depletion patterns over months of hair growth—typically two to four months, depending on coat length.3 The test uses inductively coupled plasma mass spectrometry (ICP-MS) to quantify 17 or more elements, including essential minerals, such as calcium, magnesium, potassium, zinc, and selenium, alongside toxic metals such as lead, aluminum, mercury, and arsenic.3 Beyond individual levels, key mineral ratios, such as calcium-to-magnesium and sodium-to-potassium, offer insight into adrenal stress response, energy metabolism, and inflammatory tendency.3 HTMA can help guide targeted nutritional protocols and identify whether toxic metal exposure is contributing to systemic dysregulation. Figure 4. Courtesy of Dr. Scarlett Magdalen Gut microbiome testing Comprehensive gastrointestinal microbiome panels provide a quantitative assessment of microbial diversity, the abundance of beneficial and pathogenic species, and markers of intestinal barrier integrity. For pets presenting with chronic skin disease and concurrent GI signs—loose stools, flatulence, or inconsistent appetite—gut testing can reveal dysbiosis patterns that standard fecal screens miss entirely. Microbiome testing can also identify overgrowth of organisms such as Staphylococcus on the skin surface, which research links to worsening atopic inflammation.4 Lola before. Lola, an eight-year-old spayed Bouvier’s inguinal area upon presentation. The patient had a years-long history of chronic skin and ear infections and was managed with repeated courses of steroids and antibiotics. A hair tissue analysis test revealed severely elevated sodium, sodium:magnesium, sodium:potassium ratios, and copper indicative of severe inflammation and adrenal stress. Photo courtesy Dr. Scarlett Magdalen Figure 5. Lola’s gut microbiome profile from Animal Biome indicates common bacteria are missing. Courtesy of Dr. Scarlett Magdalen. Treatment modalities with favorable safety profiles A growing body of evidence supports several transformative approaches that address chronic skin disease at a systemic level without the immunosuppressive or hepatotoxic burdens associated with long-term corticosteroid or cyclosporine use. Microbiome restoration Given the well-established role of dysbiosis in perpetuating skin inflammation, microbiome-targeted therapy is among the most evidence-supported integrative interventions available. A 2025 study in BMC Microbiology demonstrated that probiotic administration over eight to 16 weeks significantly improved both gut microbial diversity and clinical atopic dermatitis scores in dogs.7 The mechanism is multifactorial: a balanced gut microbiome upregulates regulatory T-cells (Tregs), which produce anti-inflammatory cytokines IL-10 and TGF-β, directly reducing the IgE-mediated allergic cascade responsible for atopic skin reactions.6 Additionally, butyrate produced by healthy gut microbiota promotes filaggrin expression, a key protein in skin barrier integrity.5 Species-specific probiotic blends, postbiotics, and dietary prebiotic fiber all play a role in restoring the microbial communities most disrupted in atopic animals. Photobiomodulation (therapeutic laser) For chronic skin disease, photobiomodulation’s anti-inflammatory and tissue-regenerative properties via mitochondrial activation make it a compelling tool, particularly in cases involving secondary pyoderma, chronic wounds, adrenal dysfunction, or lichenified skin. A separate in-vitro study published in the American Journal of Veterinary Research (2025) demonstrated that low-level laser therapy directly inhibited the growth of Malassezia pachydermatis, a common yeast implicated in chronic otitis and seborrheic dermatitis in dogs.11 Figure 6. Courtesy of Dr. Scarlett Magdalen. Lola’s laser protocol. Figure 7. Courtesy of Dr. Scarlett Magdalen Lola after. Lola’s abdomen one month after starting class II laser, recommended diet and nutritional supplements, as well as microbiota restorative therapy. Photo courtesy Dr. Scarlett Magdalen Medical ozone therapy Medical ozone (O₃) is generated by passing medical-grade oxygen through an ozone generator, producing a reactive oxygen species with documented antimicrobial, anti-inflammatory, and immunomodulatory properties.12,18 In veterinary dermatology, topical ozonated water, ozonated oils, and ozonated glycerin have been used to manage chronic wounds, bacterial folliculitis, hot spots, and secondary skin infections.15,16,18 A study published in Veterinary Sciences found ozonated water is as effective as traditional antiseptics, including chlorhexidine, in reducing bacterial load on dog skin.13 Research published in Research in Veterinary Science suggests ozone-based therapies can offer a promising alternative for managing staphylococcal skin disease and atopic dermatitis, particularly where multidrug resistance is a concern.14 Because medical ozone therapy does not rely on pharmaceutical agents, it carries no hepatotoxic or immunosuppressive risk when applied topically or administered systemically under proper veterinary supervision. Fern, a 3.5-year-old female spayed Pitbull mix with chronic refractory skin infections and allergies, was rescued from a shelter in December 2026. IV ozonated glycerine (Ozactin) was used alongside diet and supplements to help clear the infections, alopecia, and pruritus. Fern received the IV injections every 2-4 weeks for a total of five injections. Photos courtesy Dr. Penny Rochelle Customized clinical nutrition Nutritional intervention guided by HTMA diagnostic findings, microbiome testing, and food reactivity panels offers a systems-level approach to skin health (Figures 5-8). Omega-3 fatty acids (EPA and DHA) have well-documented anti-inflammatory effects by modulating the arachidonic acid pathway. Zinc supplementation supports keratinocyte function and immune regulation, while antioxidants such as vitamin E and selenium help mitigate oxidative stress in inflamed skin tissue. Customized clinical nutrition goes beyond generic supplement protocols; it uses individual patient data to correct specific deficiencies/imbalances and restore homeostasis from within. Tulyp, a 2.5-year-old Boxer with chronic allergies, pododermatitis, otitis, yeast overgrowth, and environmental sensitivities, was treated using an integrative protocol, including ozone therapy, UVBI, microbiome restoration, photobiomodulation, probiotics, vitamin D supplementation, and dietary modification, resulting in marked improvement within one month. Photos courtesy Dr. Jyl Rubin Therapy Protocol Rectal Ozone Therapy 45 gamma, 120 cc administered every other day for 3 weeks then weekly Ultraviolet Blood Irradiation(UVB)Photobiomodulation Intravenous treatment administered to support immune modulation, antimicrobial activity, and reduction of systemic inflammation, repeated in 30 days Ozone Baths Performed every 3 days Ozone Foaming Shampoo Used during baths to support reduction of yeast and microbial burden Ozonated Oil Applied topically to irritated and inflamed areas daily Ozone Water Spray Administered daily to affected skin areas to reduce irritation and support microbial balance Ear Ozone Treatments Administered once weekly for 6 weeks to support chronic otitis and reduce microbial burden within the ear canal Ozonated Ear Oil Applied into both ears twice weekly to reduce inflammation, support microbial balance, and maintain ear health Fatty Acid Supplementation Administered daily for skin barrier support and anti-inflammatory benefits Vitamin D3 Supplementation Administered daily to address deficiency and support immune regulation, skin health, and inflammatory balance MBRT (Fecal Microbiota Restoration Therapy) Frozen fecal slurry implanted into the transverse colon(MBRT.life) Probiotic Therapy Daily administration to support healthy intestinal microflora Photobiomodulation (Laser Therapy) Applied to affected feet twice weekly for pododermatitis for 4 weeks Dietary Therapy A complete elimination diet was implemented with removal of reactive ingredients, including potatoes, to reduce inflammatory triggers and support long-term allergy management Conclusion Chronic skin disease in pets is not simply a seasonal nuisance or a single-organ problem. It is a systemic signal. Veterinarians who engage with root-cause diagnostics—including functional tools, such as HTMA, vitamin, and gut microbiome testing—alongside integrative therapies such as microbiome restoration, photobiomodulation, and medical ozone therapy, are better positioned to interrupt the cycle of recurrence and transform disease patterns. Scarlett Magdalen, BSc, DVM, is an AVMA award-winning regenerative veterinarian with more than 15 years of clinical experience in emergency and general veterinary medicine. In 2024, she founded The Regenerative Sanctuary, an innovative veterinary healing service that combines the latest advances in human medicine and traditional Chinese veterinary medicine to optimize pets’ health. Jyl Rubin, DVM, CVA, FAAO, is an integrative veterinarian, educator, and speaker with more than 30 years of clinical experience in holistic and integrative veterinary medicine. She is the founder and owner of Dr. Rubin’s Mobile Vet Connection, Inc., a boutique integrative veterinary practice established in 1999 that serves companion animals, exotics, and farm animals through personalized, multimodal care. Dr. Rubin is also the founder and CEO of RegenO3one Vet, the first veterinary-owned medical ozone therapy company dedicated to advancing medical ozone education, equipment, and protocols for veterinarians, veterinary teams, and pet guardians. References Frick AL, Tolen AH. Tissue mineral analysis patterns in 564 dogs. AHVMA Journal. 2017;48:48–55. Frick A, Wakefield M. How to Interpret Hair Tissue Mineral Analysis in Dogs, Cats and Horses. Integrative Veterinary Education, Inc.; 2019. Drechsler Y, Dong C, Clark DE, Kaur G. Canine Atopic Dermatitis: Prevalence, Impact, and Management Strategies. Vet Med (Auckl). 2024;15:15–29. doi:10.2147/VMRR.S412570 Klinger CJ, Hobi S, Johansen C, Koch HJ, Weber K, Mueller RS. Vitamin D shows in vivo efficacy in a placebo-controlled, double-blinded, randomised clinical trial on canine atopic dermatitis. Vet Rec. 2018;182(14):406. doi:10.1136/vr.104492 Thomsen M, Künstner A, Wohlers I, Olbrich M, Lenfers T, Osumi T, et al. A comprehensive analysis of gut and skin microbiota in canine atopic dermatitis in Shiba Inu dogs. Microbiome. 2023;11:232. doi:10.1186/s40168-023-01671-2 Gonçalves M, Fernandes B, Alves SP, Pereira H, Prego MT, Lourenço AM. Preliminary measurement of faecal short-chain fatty acids in dogs with canine atopic dermatitis. Vet Dermatol. 2026;37(1):45–50. doi:10.1111/vde.70015 Song H, Mun S-H, Han D-W, Kang J-H, An J-U, Hwang C-Y, Cho S. Probiotics ameliorate atopic dermatitis by modulating the dysbiosis of the gut microbiota in dogs. BMC Microbiol. 2025. doi:10.1186/s12866-025-03924-6 Ekici YE, Ok M. Investigation of the relationship between atopic dermatitis of dogs and intestinal epithelial damage. Vet Med Sci. 2024;10(3):e1453. doi:10.1002/vms3.1453 Hao W, Hao C, Wu C, Xu Y, Jin C. Aluminum induced intestinal dysfunction via mechanical, immune, chemical and biological barriers. 2022;288(Pt 2):132556. doi:10.1016/j.chemosphere.2021.132556 Trevizan L, Fischer MM, Rodenbusch CR, Labres RV, Kessler AM. Effects of diets containing organic and inorganic zinc sources on hair characteristics, zinc concentration in blood and hair, and the immune response of dogs. Acta Sci Vet. 2013;41:1154. Analytical Research Labs, Inc. (n.d.). Hair tissue mineral analysis. ARLTMA. Retrieved May 12, 2026, from https://arltma.com/hairanalysis/ Sugita K, Shima A, Takahashi K, Ishihara G, Kawano K, Ohmori K. Pilot evaluation of a single oral fecal microbiota transplantation for canine atopic dermatitis. Sci Rep. 2023;13:8824. doi:10.1038/s41598-023-35565-y Santoro D, Saridomichelakis M, Eisenschenk M, Tamamoto-Mochizuki C, Hensel P, Pucheu-Haston C; International Committee on Allergic Diseases of Animals (ICADA). Update on the skin barrier, cutaneous microbiome and host defence peptides in canine atopic dermatitis. Vet Dermatol. 2024;35(1):5–14. doi:10.1111/vde.13215 Gil N, Santoro D, Marsella R. In vitro use of a low-level laser therapy device inhibits growth of Malassezia pachydermatis. Am J Vet Res. 2025;86(5). doi:10.2460/ajvr.24.11.0355 Bocci VA. Scientific and medical aspects of ozone therapy. State of the art. Arch Med Res. 2006;37(4):425–435. doi:10.1016/j.arcmed.2005.08.006 Rubin J, Roman M. Veterinary medical ozone therapy: an integrative approach. Vet Clin North Am Small Anim Pract. 2025;55(6):1117–1136. doi:10.1016/j.cvsm.2025.06.009 Rubin J, Roman M. A Practical Guide to Veterinary Medical Ozone Therapy. RegenO3one Vet Publishing; 2025:271,276,290–307. RegenO3one Vet. Veterinary Ozone and Ozonated Glycerin Protocol Guide. RegenO3one Vet Publishing; 2025:5,10,16,40,54,56. Pierre M, Niola C, Guerrini F, Pareto N, Mancini S, Fratini F. Evaluation of the preoperative antiseptic efficacy of ozone on dog skin in comparison with traditional methods. Vet Sci. 2025;12(9):843. doi:10.3390/vetsci12090843 Sciorsci RL, Lillo E, Occhiogrosso L, Rizzo A. Ozone therapy in veterinary medicine: A review. Res Vet Sci. 2020;130:240–246. doi:10.1016/j.rvsc.2020.03.026 Drechsler Y, Dong C, Clark DE, Kaur G. Canine atopic dermatitis: Prevalence, impact, and management strategies. Vet Med (Auckl). 2024;15:15-29. doi:10.2147/VMRR.S412570
