Ozone therapy is a medical treatment that uses ozone (O₃), a naturally occurring molecule made of three oxygen atoms, to support healing and fight infection. While oxygen (O₂) is the gas we breathe, ozone is a more reactive form that has been used in human medicine for over a century and is now increasingly applied in veterinary practice.
Medical-grade ozone is produced by passing pure oxygen through a specialised generator that uses an electrical discharge to create O₃. This ozone can then be administered in various ways depending on the condition being treated.
Ozone therapy is considered a complementary treatment, meaning it works alongside conventional veterinary medicine rather than replacing it. It is particularly valued for its ability to address conditions where conventional treatments have limitations, such as antibiotic-resistant infections or chronic wounds that are slow to heal.
Ozone is a powerful oxidiser that can destroy bacteria, viruses, fungi, and other pathogens. It works by damaging the cell walls of microorganisms, making it effective even against antibiotic-resistant bacteria like MRSA. Unlike antibiotics, pathogens cannot develop resistance to ozone because of the way it attacks them.
When ozone interacts with blood or tissues, it triggers a cascade of effects that improve how efficiently oxygen is delivered to cells. This enhanced oxygenation supports healing, reduces inflammation, and helps damaged tissues recover more quickly.
Ozone therapy stimulates the immune system by activating white blood cells and promoting the release of cytokines (signalling molecules). This helps the body mount a more effective response to infection and inflammation.
By modulating oxidative stress and cytokine activity, ozone therapy can reduce inflammation without the side effects associated with long-term use of anti-inflammatory drugs.
Ozone promotes angiogenesis (the formation of new blood vessels) and stimulates growth factors that accelerate wound healing and tissue repair.
Ozone therapy is used across a wide range of veterinary applications, from companion animals to horses and farm livestock.
One of the most established uses of ozone therapy is in treating wounds, particularly those that are infected, necrotic (containing dead tissue), or slow to heal. Ozone is effective for:
Ozonated oils and ozonated water are particularly useful for topical wound care, providing sustained antimicrobial action while promoting tissue regeneration.
Ozone injections are increasingly used to treat joint and soft tissue problems in both small animals and horses:
Studies have shown that intra-articular ozone injections can reduce pain and improve mobility, often used alongside other regenerative therapies such as platelet-rich plasma (PRP).
Ozone is particularly well-suited to dental applications because it can reach areas that are difficult to clean mechanically:
Ozonated water can be used as an oral rinse during dental procedures, while ozone gas can be applied directly to periodontal pockets.
Recurrent or resistant otitis (ear infections) respond well to ozone therapy, particularly when conventional treatments have failed. Ozonated oils can be applied directly to the ear canal, providing antimicrobial action without contributing to antibiotic resistance.
In horses and farm animals, ozone therapy has shown particular promise for reproductive conditions:
Intrauterine ozone therapy offers an alternative to antibiotics, which is especially valuable in food-producing animals where withdrawal periods are a concern, and on organic farms.
Beyond treating individual animals, ozone is used to sterilise veterinary environments:
Reduction of antibiotic-resistant bacteria in the environment
Topical application: Ozonated oils (such as olive or sunflower oil) and ozonated water are applied directly to wounds, skin conditions, or ears. This is the simplest and most accessible form of ozone therapy.
Rectal insufflation: Ozone gas is gently introduced into the rectum, where it is absorbed into the bloodstream. This provides systemic effects and is commonly used for general immune support and internal conditions.
Intra-articular injection: Ozone is injected directly into joints for arthritis and other joint conditions.
Perilesional injection: Ozone is injected around wounds or affected areas to promote local healing.
Ozonated saline: A saline solution infused with ozone. It is not intended for intravenous administration; rather, it is used as a lavage solution for various applications, including wound irrigation, oral cavity lavage, ear lavage, intra-uterine lavage, and joint lavage.
Autohemotherapy: Autohemotherapy involves withdrawing a measured amount of the patient’s blood, exposing it to a controlled oxygen–ozone mixture, and reinfusing it. Ozone reacts with plasma components to generate short-lived signalling molecules that trigger oxidative preconditioning, stimulate endogenous antioxidant systems, and exert immunomodulatory effects. The treatment may also improve oxygen metabolism and microcirculation by enhancing erythrocyte function and tissue oxygen delivery.
Ozone bagging: Limbs or other body parts are enclosed in a bag filled with ozone gas for localised treatment.
The evidence base for ozone therapy in veterinary medicine is growing, though it remains an emerging field. As of 2025:
Beyond these areas, veterinary studies also explore ozone therapy in dermatological disorders, otitis, gastrointestinal conditions, and general immune support, highlighting its versatile potential across multiple species and clinical scenarios.
The strongest veterinary evidence exists for:
Research continues to expand, with increasing numbers of controlled studies examining specific applications. While ozone therapy is not yet approved as a mainstream treatment by veterinary regulatory bodies, it is widely used in integrative and rehabilitation practices based on the existing evidence and clinical experience.
When administered correctly by trained professionals, ozone therapy has an excellent safety profile. Key safety considerations include:
Side effects are rare when ozone therapy is administered correctly. The most common issue is minor discomfort at injection sites, which typically resolves quickly.
Ozone therapy is often particularly suitable for animals that cannot tolerate conventional medications, elderly patients, or those with compromised immune systems.
Ozone therapy occupies a unique regulatory position:
As with any treatment, the decision to use ozone therapy should be made in consultation with a qualified veterinary professional who can assess whether it is appropriate for your animal.
This depends on the condition being treated. Acute conditions may respond to just a few treatments, while chronic conditions typically require a series of treatments (often 2-3 times weekly for 2-4 weeks) followed by maintenance sessions.
Most ozone treatments cause minimal discomfort. Topical applications are painless. Injections may cause brief discomfort similar to any injection, but this typically resolves within minutes.
In some cases, ozone therapy can reduce or eliminate the need for antibiotics, particularly for localised infections and wound care. However, it should be viewed as complementary to conventional treatment rather than a replacement. Your vet will advise on the best approach for your animal.
Some effects, such as wound cleaning and pain relief, may be noticeable within days. Other benefits, such as tissue regeneration and resolution of chronic conditions, may take several weeks of treatment.
Ozone therapy can be used in most species, including dogs, cats, horses, cattle, sheep, goats, and exotic animals. However, individual suitability depends on the specific condition and overall health status. A veterinary assessment is always required.
Ozone therapy is offered by veterinary practices specialising in integrative, rehabilitation, or holistic medicine. Your regular vet may be able to refer you, or you can contact Ozone Animal Health for guidance on practitioners in your area.
Some forms of ozone therapy, such as application of ozonated oils to wounds, can be done at home under veterinary guidance. However, other forms (injections, insufflation) must be performed by trained professionals. Ozone generators and ozonated products should only be used following proper instruction.
