Hip dysplasia (HD) is one of the most common causes of long-term hip pain and reduced function in dogs, especially in medium and large breeds. Many dogs can be kept active with a combination of weight control, adapted exercise, pain relief as needed and targeted rehabilitation. As part of that package, more people also choose light therapy, either as laser treatment at a clinic or as LED-based treatment at home.

Light therapy cannot change the shape of the joint itself, but in some cases it can provide better pain relief, more willingness to move and easier day-to-day function when used systematically and with a plan that fits the dog’s size, coat and symptoms.

HD in everyday life: what is it that hurts?

With HD, the femoral head and hip socket do not fit together optimally. This can cause abnormal loading, irritation of the joint capsule and surrounding tissues, and gradual development of osteoarthritis (arthrosis). The pain rarely comes only from “the joint itself”. Many dogs also develop sore muscles in the glutes, lower back and hamstrings because they compensate in their movement.

Some dogs show obvious lameness. Others “hold back” more subtly: they get up more slowly, do not jump into the car, want shorter walks, or become stiffer after rest.

What is meant by light therapy for dogs?

When talking about light therapy for HD, it is typically photobiomodulation with red and infrared light. It can be delivered as:

• Low-level laser therapy (LLLT), often around 808 nm, where you work point by point with a relatively precise dose.
• Higher-power laser (used in clinics), often around 980 nm, where more energy can be delivered in a shorter time.
• LED-based light therapy (red and infrared), often as pads, mats or applicators that cover larger areas at a time and are well suited for home use.

The shared idea is to deliver a controlled light dose that supports the body’s natural processes in the tissue. In studies on dogs with joint problems, in several cases there is better owner-rated pain, improved activity level and less stiffness over a course of a few weeks, but results are not consistent across all trials. That makes protocol and follow-up especially important.

What is a “protocol” in practice?

A protocol is a plan for:

1. where you treat (points/areas),
2. how much light (dose),
3. how often and for how long,
4. when you adjust.

For HD, it often makes sense to think in two tracks: treating the hip itself and treating the muscles that typically become overloaded.

Typical treatment areas around the hip, once a professional has shown you where you can work safely, are:

• the hip joint area laterally
• gluteal muscles (gluteal region)
• hamstrings
• front thigh muscles (quadriceps)
• lower back/transition to the pelvis
• around the knee, if the dog is clearly compensating

Doses and intervals: what does the evidence suggest?

There is no single international standard for HD, but there are some reasonable “frameworks” from clinical studies and common practice in veterinary rehabilitation.

• With low-level laser around 808 nm, protocols are seen with approximately 4–5 J/cm² at the joint and around 4 J/cm² over musculature, often as weekly treatments for 6 weeks in a clinical setting.
• With higher-power laser around 980 nm, doses in the range of 10–20 J/cm² are seen, often with a plan that starts more frequently and then tapers down over about 6 weeks.
• With LED-based treatment (red and infrared), manufacturers’ recommendations vary, but many fall within a broad range around 5–50 J/cm², often as shorter, frequent sessions. Here, it is especially beneficial to work consistently and monitor the response closely.

The most important thing is not to chase a single number, but to ensure a plan that can be repeated, measured and adjusted.

Examples of protocols often used for hip problems

This table is a practical starting point for dialogue with your veterinarian or physiotherapist. It is not a substitute for an individual assessment, especially if the dog has another condition, has recently had surgery, or if there is suspicion of an acute injury.

How to adapt an HD protocol to the dog’s size and coat

Two dogs with the same X-ray findings can respond differently. Partly because pain is individual, and partly because coat and body size affect how much light reaches the tissue.

A simple rule of thumb in clinical protocols is that dark and dense coats and larger dogs often require longer treatment time per point to reach the same target dose at depth. Some also choose infrared as a larger part of the treatment when they want to work deeper.

It is also common to start gently, assess the response after 1 to 2 weeks, and then adjust upwards if the dog tolerates it well and is still clearly affected.

A single session should ideally not “surprise” the body. With light therapy, you often see the best effect when the dose is appropriate and repeated regularly.

Home treatment: safety and consistent routines

Home treatment with LED-based equipment can be a good support for chronic hip problems, especially when combined with exercises and a load-management plan. However, it requires working in a structured way and watching for signs of both progress and overuse.

Here are practical safety and quality measures that often bring peace of mind to the process:

• Use protection: use eye protection if the equipment requires it, and avoid light directly into the eyes
• Check skin and heat: the area may become warm, but not hot or irritated
• Stick to the same pattern: same side(s), same areas, same duration for a period, so you can assess the effect
• Plan breaks: schedule rest days or reduce frequency if the dog seems more sore the next day

If you use laser (not LED), it should normally be done via a veterinarian or trained practitioner, both for eye safety and correct dosing.

How quickly can you expect changes?

Many owners notice small signs early: easier to get up, more willingness to walk, or less “start-up stiffness”. In some studies, reductions in owner-reported pain are seen after a short time, while more objective changes in activity often build over several weeks.

It helps to measure something concrete instead of only “going by feel”. A simple logbook can be enough.

Write down the same three things every day in 2 minutes.

After 2 to 3 weeks, you will have a pattern that is easy to use in dialogue with your practitioner.

Evaluation: measure what you want to improve

When the goal is better function with HD, it is rarely a single score that tells the whole story. A practical approach is to combine a couple of home observations with a professional assessment when needed.

Here is a small set of measurement points that often makes sense:

• Everyday function: getting up, climbing stairs, jumping into the car, pace on walks
• Signs of pain: licking at the hip, restlessness at night, shorter fuse when touched
• Activity: steps or minutes of gentle movement daily (a phone or activity tracker can be used)
• Symmetry: does the dog load both hind legs, or does it “drop” into one side?

If a veterinarian or physiotherapist is following the course, they can supplement with lameness assessment, range of motion and muscle status.

Light therapy works best as part of a complete HD programme

When you see the best courses for HD, light therapy is typically one piece of the puzzle. It makes it easier for the dog to move, and that creates the opportunity to build strength and stability, which in the long term means a lot for function.

A complete programme may include:

• Weight and feeding: small weight losses can make a big difference to the load on the hip
• Controlled exercise: several short walks rather than a few long ones, especially in start-up periods
• Strength and stability: simple exercises targeting the hindquarters, core stability and balance
• Medical pain plan: agreed with the veterinarian and adjusted based on response

In practice, light therapy can be what “opens the window” so the dog can actually do the exercises without becoming more sore.

Maintenance: once things have settled

Once the dog is more stable, many choose a maintenance rhythm. This may be 2 to 4 LED treatments per week for a period, or shorter “boost” courses during periods of more stiffness, cold weather or increased activity.

This is also where practical home-use products can make sense, if they are CE-approved and easy to use consistently. Some Danish manufacturers and retailers, including Heat Sense, work specifically with light therapy and laser therapy devices aimed at both home and clinic use, where instruction, safety and correct use are emphasised in the guidance.

When should the protocol be changed or paused?

If the dog becomes more lame, clearly more affected by pain, or develops new symptoms, it is rarely the time to simply “turn it up”. It is time to stop and assess the cause.

Typical signs that you should adjust together with a professional are:

• New or increasing lameness: especially if it does not subside after 24 to 48 hours
• Unexpected tenderness to touch: over the hip or in the lower back after the treatments
• Drop in activity level: less willingness to walk, more rest than usual
• Behaviour change: restlessness, poorer sleep or reduced appetite

With HD, fluctuations are normal, but a good protocol is precisely one that can be adjusted without losing direction.

Clinical quality: what you can ask about

If you receive laser treatment at a clinic or are considering equipment for home use, it is reasonable to ask how the dose is chosen and how the effect is monitored.

Feel free to ask: which wavelength is used, whether the goal is a specific J/cm², which areas are treated, and how it is assessed whether frequency or duration should be changed. A serious plan is typically simple, repeatable and tied to concrete goals for your dog’s everyday life.