PAIN & REHABILITATION · OWNER EDUCATION
Laser Therapy (Photobiomodulation)
Understand therapeutic laser treatment, where it may fit into a pain or rehabilitation plan, what the evidence can and cannot tell us, and how safety and response are monitored.
Before making a decision
This guide supports discussions with the professional responsible for your animal’s care. The species listed are the scope of the article; individual procedures, medications and preparation instructions still depend on the patient. Ask for a written plan that explains the goal, alternatives, expected response and when to call.
Do not change a prescription, fasting plan, feeding method or bandage based on another animal’s experience. If the instructions are unclear, contact the treating team before proceeding.
What laser therapy means
Therapeutic laser treatment uses selected wavelengths of light, usually red or near-infrared, to influence biological activity in tissues. The broader name is photobiomodulation. A veterinarian may consider it as one part of a plan for discomfort, soft-tissue injury or wound recovery. It is different from a surgical laser that cuts tissue, and different from ionizing radiation used for cancer treatment. An animal does not become radioactive after a therapeutic laser session.
The description identifies a type of treatment, not a guaranteed outcome. The tissue being treated, the diagnosis and the way light is delivered all matter. A clinic offering laser therapy should first explain what problem it intends to address. Light treatment cannot replace stabilizing a fracture, removing an obstruction, treating an infection appropriately or investigating an unexplained painful lump.
Why your veterinarian may discuss it
Possible discussions include support for a painful joint, a rehabilitation program, selected tendon or ligament problems, or a wound-care plan. In a chronic condition, the goal may be easier movement or improved daily comfort rather than a cure. In a recovering injury, the goal should be tied to a particular stage of healing. Ask which outcome is expected for your animal and which other treatments remain necessary.
A recommendation may arise when the team is trying to combine several approaches to pain. That does not mean prescribed medicines should be stopped, or that every patient unable to tolerate one medicine will benefit from laser treatment. Nutrition, appropriate activity, environmental changes and diagnosis-specific treatment may remain central. Discuss the entire plan rather than evaluating a laser package in isolation.
How strong is the evidence?
Veterinary evidence is mixed and depends on the condition and species. AAHA pain guidelines place physical modalities within a broader approach and acknowledge limited evidence for several uses. A published systematic review of studies in dogs, cats and horses found conflicting results and substantial limitations in study quality. Other veterinary reviews describe promising findings for some uses while identifying many unanswered questions. Popularity alone does not establish that a treatment will help this patient.
Ask whether the supporting research involved animals with the same problem, or laboratory tissue and a different disease. Device settings and treatment schedules vary between studies, which makes comparisons difficult. A reasonable trial has a defined goal, a review point and a plan if improvement is absent. The explanation should make room for uncertainty rather than promising cartilage regrowth, immediate healing or permanent relief.
When laser should be avoided or needs specialist evaluation
Cancer warrants a precautionary approach. Avoid routine therapeutic laser treatment in an animal with known or suspected cancer, including treatment away from a visible tumor. This is a precaution because malignant cells may exist beyond the recognized lesion and the clinical risk is not fully established. Concern that light could stimulate cancer-cell activity does not prove that a session will accelerate cancer or stimulate circulating malignant cells. Discuss other comfort options with the treating veterinarian or oncologist, and follow the contraindications for the specific device. Merck specifically lists lymphoma as a contraindication.
If your animal has an autoimmune disorder, including immune-mediated polyarthritis, arrange evaluation by a veterinary internal medicine specialist before considering therapeutic laser. The specialist should assess disease activity, current treatment and whether laser is appropriate, and establish a plan for close monitoring before any sessions begin. Approval should not be assumed because laser is used for osteoarthritis: immune-mediated joint inflammation is a different condition.
Laser can alter immune and inflammatory responses. Published mechanistic discussions raise concern about aggravating autoimmune disease, and Merck warns that immunostimulatory effects may conflict with immunosuppressive medication. This supports caution, but does not establish that laser consistently causes autoimmune joint flares in veterinary patients. References differ in how they classify immunosuppressive medication as a contraindication or precaution. Do not start treatment independently or stop immune-suppressing medication to make an animal eligible. If treatment is considered appropriate after specialist assessment, ask how joint pain, swelling, mobility and disease control will be reassessed, and when treatment should be stopped.
Direct eye exposure must be avoided; protective goggles do not make aiming a beam at an eye safe. Direct treatment over the thyroid should be avoided, particularly with an overactive gland. Avoid treatment over a pregnant uterus or abdomen, and disclose possible pregnancy before considering any site. These restrictions concern both the treatment location and the individual patient, and the device instructions may be more restrictive.
Disclose epilepsy or any seizure history. Veterinary guidance identifies treatment over the head and neck in patients with epilepsy as a relative contraindication or precaution; this is not evidence that every treatment elsewhere is safe. The clinician must review the patient and device instructions before proceeding. Active bleeding and medicines that increase light sensitivity also need explicit review. Do not use a general list of possible benefits as permission to disregard a contraindication.
Preparing for a session
Bring the diagnosis, imaging or operation reports when another clinic is providing treatment. Describe current medicines, changes in movement and any skin irritation, wound drainage or new swelling. Tell the clinician about a known or suspected tumor, possible pregnancy and any other illness. The team needs this information to decide whether treatment of a particular area is appropriate; an owner should not select sites or settings independently.
Ask whether coat preparation is needed and whether any topical products should be avoided before the visit. Hair, skin pigmentation and tissue depth can influence delivery, so one animal’s settings are not a template for another. Obtain instructions about feeding and medications if sedation is being considered. Do not withhold food or stop a prescription simply because the appointment includes laser treatment.
What happens at the clinic
A trained team identifies the treatment area and uses the selected device according to the clinical plan and its safety requirements. Many sessions can be performed while the animal is awake, with calm handling and positioning that protect a painful area. The patient’s comfort should be assessed throughout. An animal that struggles or becomes distressed may need a different approach rather than repeated forceful restraint.
Appropriate laser eye protection is required for the patient and people in the treatment area. Ordinary sunglasses should not be assumed suitable. Higher-powered equipment can cause burns if used incorrectly, and direct eye exposure can cause serious injury. A session should be paused if the animal appears uncomfortable. Terms such as cold laser do not remove the need for professional training, safe equipment and attention to heat.
Differences between species
Dogs and cats may tolerate positioning and handling differently. A cat may need shorter, calmer visits and a plan that respects hiding, fear and its preferred posture. A dog with difficulty breathing or poor balance may need additional accommodation. The clinician should distinguish treatment of the painful condition from stress caused by the visit. A quiet patient is not necessarily a comfortable patient.
Equine use requires a lameness or wound assessment and safe handling arrangements. Treatment should fit the veterinarian’s rehabilitation plan, not a wish to return immediately to work. Much equine research concerns horses, so a donkey or mule needs individual judgment. Use in rabbits, birds, reptiles or other animals requires separate species expertise; the species listed here do not establish universal safety or an effective protocol for every indication.
Measuring benefit without confusing it with healing
Choose practical observations before treatment begins: getting up from a bed, reaching a familiar resting place, walking comfortably to necessary resources or tolerating ordinary care. Use short videos of normal activity when useful, without forcing exercise to demonstrate pain. For wounds, the treating team may follow examination findings and photographs. Record other treatment changes so improvement is not automatically attributed to the laser alone.
Agree on when progress will be reviewed and what would justify continuing, modifying or stopping the course. Some problems need ongoing management, but repeated sessions without measurable benefit deserve reconsideration. Improved comfort does not prove that a repaired bone, tendon or surgical incision is ready for unrestricted activity. Keep prescribed restrictions until the clinician authorizes progression.
Home care and warning signs
Continue the written medication, exercise and wound-care plan. Do not apply a consumer laser, light panel or another animal’s device settings to an injury without veterinary approval and training. Devices differ, and greater power or longer exposure is not automatically better. Discuss the cost and travel burden of repeat visits along with the expected benefit. A useful plan should be feasible for both animal and caregiver.
Contact the treating team for new redness, skin discomfort, swelling, worsening lameness or failure to improve. Sudden inability to bear weight, severe pain, wound opening or an eye problem needs prompt assessment. Collapse, breathing difficulty or a sudden major neurologic change warrants emergency care. These signs should not be dismissed as an expected treatment reaction or managed by simply booking another laser session.
Questions to ask your care team
- What is the diagnosis and the specific goal of laser treatment for my animal?
- How strong is the evidence for this condition and species, and what alternatives have better support?
- How will you protect eyes, manage handling and check that treatment is comfortable?
- What will we measure, when will we review the response, and when would you stop treatment?
- Do any cancer, autoimmune disease, thyroid condition, seizure history, pregnancy or medicines rule out treatment, and is specialist evaluation needed?
Sources behind this guide
AAHA: Veterinary laser therapy and safetyVeterinary or animal-health guidance ↗AAHA pain guidelines: Acute versus chronic painVeterinary or animal-health guidance ↗Millis and Bergh: Systematic literature review of veterinary laser therapyVeterinary or animal-health guidance ↗Bunch: Photobiomodulation literature updateVeterinary or animal-health guidance ↗UC Davis: Sports medicine and rehabilitation serviceVeterinary or animal-health guidance ↗Merck Veterinary Manual: Photomedicine contraindications and drug interactionsVeterinary or animal-health guidance ↗Texas Veterinary Medical Association: Therapy contraindications and precautionsVeterinary or animal-health guidance ↗de Freitas and Hamblin: Proposed photobiomodulation mechanisms and immune effectsVeterinary or animal-health guidance ↗Content last reviewed: October 6, 2026. Review status: veterinary-informed; independent veterinarian review not yet completed.
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