These treatments are increasingly offered at vet clinics and physiotherapy practices. But what does each one actually do, and is there evidence they work?
Walk into a veterinary physiotherapy clinic these days and you'll likely see equipment that wouldn't look out of place in a sci-fi film. Lasers. Electromagnetic devices. Ultrasound machines.
These modalities fall under the umbrella of physical therapy, and they're becoming more common in canine rehabilitation and pain management. Some owners swear by them. Others wonder if they're just expensive gimmicks.
The truth sits somewhere in between. Each of these treatments has a physiological basis, some evidence behind it, and specific situations where it might help. None of them are miracle cures. All of them work best as part of comprehensive care rather than standalone treatments.
Laser Therapy (Photobiomodulation)
Laser therapy is probably the most widely used of these modalities. You'll find it in general vet practices, physiotherapy clinics, and rehabilitation centres.
What It Is
Therapeutic laser uses specific wavelengths of light to penetrate tissue and stimulate cellular activity. It's also called photobiomodulation, cold laser therapy, or low-level laser therapy (LLLT).
The light energy is absorbed by cells, particularly by mitochondria. This triggers increased ATP production, improved blood flow, reduced inflammation, and potentially faster tissue repair. Different wavelengths penetrate to different depths — red light affects superficial tissues, near-infrared reaches deeper structures.
What the Evidence Shows
The positive:
- • Reduced pain and improved function in dogs with osteoarthritis
- • Faster wound healing
- • Reduced inflammation and swelling after injury or surgery
- • Many dogs show improved comfort and mobility
The limitations:
- • Treatment protocols vary widely
- • Results are inconsistent
- • Many studies are small or have methodological limitations
Best evidence for:
Osteoarthritis pain, post-surgical healing, wound healing, acute soft tissue injuries
Weaker evidence for:
Deep joint conditions, chronic structural damage, neurological conditions
What Treatment Looks Like
A handheld device is moved over the affected area. Treatment typically takes 5-15 minutes. Most dogs tolerate it well — they feel warmth but no pain. Many relax during treatment. Sessions are usually done 2-3 times per week initially.
Cost: Typically £30-60 per session. Often included as part of physiotherapy appointments.
PEMF (Pulsed Electromagnetic Field Therapy)
PEMF has been around for decades in human medicine and is gaining traction in veterinary care.
What It Is
PEMF devices generate electromagnetic fields that pulse at specific frequencies. These fields penetrate tissue and are thought to influence cellular activity, particularly in bone, cartilage, and soft tissue. Devices range from small portable units to large mats or beds the dog lies on.
What the Evidence Shows
The positive:
- • Human studies show benefit for bone healing, osteoarthritis, and chronic pain
- • Some veterinary studies show improved fracture healing and OA outcomes
- • Non-invasive and appears very safe
- • Many owners and practitioners report positive results
The limitations:
- • Fewer high-quality veterinary studies compared to laser
- • Huge variation in devices, frequencies, and protocols
- • Difficult to blind studies
- • Placebo effect hard to rule out
What Treatment Looks Like
For mat or bed systems, the dog simply lies on the device. For targeted units, the applicator is held over the affected area. Sessions typically last 20-30 minutes. Dogs usually find it relaxing — some fall asleep.
Cost: Clinical sessions £40-70 per treatment. Home units available for £200-800, which can be cost-effective for long-term use.
Therapeutic Ultrasound
Not to be confused with diagnostic ultrasound (used for imaging), therapeutic ultrasound uses sound waves to treat tissue.
What It Is
A transducer emits high-frequency sound waves that penetrate tissue. These waves cause microscopic vibrations that generate heat in deeper tissues and create mechanical effects at the cellular level. The heat increases blood flow and tissue extensibility. The mechanical effects may stimulate cellular repair and reduce muscle spasm.
What the Evidence Shows
The positive:
- • Established use in human physiotherapy
- • May help with muscle spasm, scar tissue, and soft tissue healing
- • Some studies show benefit for tendon injuries
- • Useful for heating deeper tissues before stretching
The limitations:
- • Human evidence has weakened in recent years
- • Veterinary-specific research is limited
- • Effects may be modest
- • Requires skilled application to be effective
What Treatment Looks Like
The area is clipped or shaved and coupling gel is applied. The transducer is moved continuously over the treatment area. Sessions typically last 5-10 minutes per area. Can feel warm.
Cost: Usually £30-50 per session, often as part of a physiotherapy appointment.
Comparing the Three
When These Therapies Make Sense
Consider these modalities when:
- • Conventional treatment alone isn't enough
- • Medication isn't tolerated (kidney, liver, or stomach issues)
- • Post-surgery recovery support is needed
- • Chronic conditions require ongoing management
- • As part of comprehensive physiotherapy
Less likely to help when:
- • Used as standalone treatments
- • Conditions need surgery (ruptured ligament, severe fracture)
- • The basics aren't optimised (weight, exercise)
Questions to Ask
"What specific condition are we treating?" Different modalities suit different problems. Make sure there's a rationale for the choice.
"What's the evidence for this treatment in this condition?" A good practitioner will be honest about what we know and don't know.
"How will we know if it's working?" There should be a plan for assessing response, ideally with objective measures.
"How does this fit with other treatments?" These modalities should complement comprehensive care, not replace it.
"What's the total expected cost?" Including initial course and likely ongoing maintenance.
Home Devices: Worth It?
PEMF Home Units
Pros: Convenient, cost-effective long-term, safe and easy to use.
Cons: Quality varies. Cheap devices may be ineffective.
Verdict: Reasonable option if your dog responds well in clinic.
Laser Devices
Pros: Some lower-power devices available.
Cons: Effective therapy needs higher power. Eye protection essential. Home devices may be under-powered.
Verdict: More cautious recommendation. Professional may be better.
Ultrasound Devices
Pros: Some available for home use.
Cons: Requires skill. Easy to use incorrectly. Inappropriate use can cause harm.
Verdict: Generally better left to professionals.
The Bottom Line
Laser, PEMF, and therapeutic ultrasound are legitimate treatment options with physiological mechanisms and varying levels of evidence supporting their use.
They're not magic. They're not substitutes for proper veterinary care. They work best as part of comprehensive management rather than standalone treatments.
For the right dog with the right condition, they can make a genuine difference to comfort and quality of life. The sensible approach is to understand what each therapy does, have realistic expectations, find a qualified practitioner, give treatments a fair trial, and assess response objectively. These modalities are tools. Like all tools, their value depends on using them appropriately for the right job.