How Vets Diagnose Lameness In Dogs: What Your Dog’s Limp Can Tell Us

Written by Dr Leigh Davidson BVSc, BApplSc

If your dog has suddenly become lame and you are trying to decide what to do right now, start here: Dog Suddenly Limping: What To Do At Home And When To Call A Vet.

One minute your dog is running around normally. The next, they are holding a back leg up, skipping for a few steps, or looking at you as though something is very wrong.

Lameness can be confusing because a limp is not a diagnosis. It’s a clue.

A dog’s limp may come from the paw, nails, muscles, tendons, knee, hip, spine, nerves or joints. Sometimes the cause is minor. Sometimes it’s a sign that your dog needs urgent veterinary care.

At Your Vet Online, we often help owners work out what their dog’s lameness could mean, whether it can wait, and what information will help their vet make a diagnosis.

How Do Vets Diagnose Lameness In Dogs?

Vets diagnose lameness by looking at the history, watching how the dog moves, examining the painful or abnormal area, and deciding whether further tests such as X rays, ultrasound, CT, MRI or blood tests are needed.

A proper lameness assessment usually starts with three questions:

1. When did the limp start?
2. What does the limp look like?
3. Is this pain, weakness, instability or a nerve problem?

This matters because a sudden back leg limp after running may suggest an injury, while stiffness after rest may suggest arthritis. A dog that’s dragging toes or wobbling needs a different approach because that can point to a nerve or spinal problem.

A vet will gather history and perform gait analysis and physical examinations as the starting point for musculoskeletal pain and lameness, with neurological assessment used to rule out nerve related causes.

What Your Dog’s Limp Can Tell Us

Step 1: When Did The Limp Start?

The timing of the limp gives your vet important information.

Sudden lameness

A sudden limp may happen after:

• Running
• Jumping
• Slipping
• Rough play
• A fall
• Being hit or knocked
• Getting a nail, thorn or grass seed injury
• Twisting the knee or hip

A sudden non weight bearing back leg limp can be seen with injuries such as cruciate ligament rupture, fractures, joint trauma, hip luxation, severe soft tissue injury or paw trauma.

Cranial cruciate ligament disease is one of the most common causes of hindlimb lameness in dogs, and it can occur after trauma, but most commonly through progressive ligament degeneration.

Gradual lameness

A limp that develops slowly may be linked to:

• Arthritis
• Hip dysplasia
• Cruciate ligament degeneration
• Patellar luxation
• Muscle strain
• Tendon injury
• Spinal disease
• Neurological disease
• Bone disease
• Infection

Gradual lameness is still important. Dogs often hide pain well, and by the time owners notice stiffness, slowing down or reluctance to jump, the problem may have been building for some time.

Step 2: What Does The Limp Look Like?

The way your dog moves can tell us a lot.

A full lameness examination will involve your vet watching the way your dog moves:

• Walking
• Trotting
• Turning
• Sitting
• Rising from lying down
• Climbing a step if safe
• Moving on different surfaces

This is called gait assessment. It helps the vet decide whether the lameness is affecting one leg, both back legs, the spine, or the nervous system.

Dogs with rear limb lameness may show different patterns depending on whether the problem is more likely to involve the stifle, hips, lower back or neurological system. It also highlights that orthopaedic problems may seem to improve once the dog warms up, while neurological problems may worsen with activity.

Step 3: What Type of Lameness Does This Suggest?

Once your vet knows when the lameness started and what your dog’s movement looks like, the next step is to interpret what that pattern may mean.

This is where vets start asking a more clinical question:

Is this most likely coming from pain, mechanical restriction, weakness, incoordination, or a combination of these?

This matters because a sore knee, a slipping kneecap, arthritis, a spinal cord problem and nerve weakness can all look like “limping” at home, but they need very different diagnostic pathways.

Pain Related Lameness

Pain related lameness is often linked to problems in the paws, nails, bones, joints, muscles, tendons or ligaments.

However, pain does not always come from the leg itself.

Neck pain, back pain and spinal pain can also change how a dog moves. Conditions such as intervertebral disc disease, or IVDD, can be incredibly painful. Some dogs with IVDD will look stiff, guarded or reluctant to walk. Others may cry when they move, avoid lowering their head, arch their back, refuse stairs, or appear lame because movement hurts.

This is one reason vets do not only examine the sore leg. They also assess the spine, neck, posture, comfort level and neurological function.

Common causes include:

• Paw injury
• Broken nail
• Muscle strain
• Cruciate ligament disease
• Hip pain
• Arthritis
• Fracture
• Joint trauma
• Infection
• Neck pain
• Back pain
• Intervertebral disc disease
• Spinal inflammation or injury
• Septic arthritis
• Bone infection
• Abscesses or bite wounds
• Immune mediated polyarthritis
• Spinal inflammation or injury

A painful dog may still walk, but they often change how they move to protect the sore area. Some dogs shorten their stride. Some hold a leg up. Some walk with a stiff, guarded posture. Some simply refuse to move because it hurts too much.

Pain with weakness, toe dragging, wobbliness or loss of bladder or bowel control is especially concerning and needs prompt veterinary care.

Infection and Immune Mediated Lameness

Not all lameness comes from injury, arthritis or a structural problem.

Infection and immune mediated disease can also cause lameness. These dogs may look sore, stiff, weak or reluctant to move, but the problem may involve inflammation inside one or more joints, infection around a joint, infection in bone, or immune mediated inflammation affecting multiple joints.

This is especially important when lameness is associated with signs such as:

• Fever
• Lethargy
• Reduced appetite
• A swollen or warm joint
• Pain in more than one limb
• Stiffness affecting several legs
• Lameness that shifts from one leg to another
• Reluctance to get up
• Crying or marked pain when handled
• Recent wound, bite, surgery or penetrating injury
• A dog that seems generally unwell, not just lame

Septic arthritis means infection inside a joint. It can cause lameness, joint swelling, pain, stiffness, fever and reduced appetite. This can be serious because infection inside a joint can damage joint structures if not treated promptly.

Immune mediated polyarthritis, often shortened to IMPA, is different. In this condition, the immune system causes inflammation inside multiple joints. Dogs may have shifting leg lameness, fever, lethargy, reduced appetite, painful joints and sometimes severe stiffness or inability to walk normally.

This is why vets ask about more than the limp itself. They also want to know whether your dog is eating, bright, feverish, stiff in more than one leg, or generally unwell.

If infection or immune mediated disease is suspected, your vet may recommend tests such as blood tests, X rays, joint fluid analysis, urine testing or further imaging, depending on the signs.

Mechanical Lameness

Mechanical lameness happens when the limb cannot move normally because something is catching, slipping, unstable or restricted.

Sometimes these types of lameness are not painful. It may be a functional lameness.

This can occur with:

• Patellar luxation
• Joint instability
• Tendon injury
• Reduced joint range of motion
• Muscle contracture
• Limb deformity
• Old injury

For example, a dog with a luxating patella may skip for a few steps when the kneecap slips out of position, then walk normally again when it moves back.

Paresis: Weakness Within a Lameness Assessment

Paresis means weakness or reduced ability to move the limb normally.

This can happen when there is a problem with the spinal cord, nerves, muscles or the connection between the nerves and muscles.

In a lameness assessment, paresis is important because the dog may not simply be protecting a painful joint. They may be unable to place or use the leg properly.

This can change the diagnostic direction from an orthopaedic workup to a neurological or neuromuscular assessment.

Ataxia: Incoordination Within a Lameness Assessment

Ataxia means incoordination.

An ataxic dog may have some strength, but the nervous system is not accurately controlling where the limbs are placed.

This can happen with problems affecting the brain, spinal cord, balance system or sensory pathways that tell the body where the feet are.

In a lameness assessment, ataxia is important because it suggests the problem may not be in the leg itself. It may be coming from the nervous system.

Why this step matters

This is the point where your vet starts narrowing the problem.

This is why a proper lameness examination is more than simply finding “the sore leg”. It involves assessing the whole body and may result in your vet recommending further diagnostics such as blood tests, urine samples, radiographs, ultrasound, CT or MRI.

Weakness or Incoordination Changes the Urgency

Weakness, toe dragging, knuckling, wobbliness or sudden loss of coordination should not be treated as a simple limp.

These signs can point to spinal cord, nerve or muscle disease and may need prompt veterinary care, especially if they appear suddenly or are getting worse.

Seek veterinary care promptly if your dog:

• Is dragging one or both back legs
• Is wobbling or falling
• Is knuckling over
• Has suddenly become weak
• Cannot get up
• Has back pain
• Has lost bladder or bowel control
• Is getting worse quickly

A painful gait, weak gait and uncoordinated gait can all be part of a lameness presentation, but they point your vet in different diagnostic directions.

Step 4: Which Part of the Leg is Involved?

Back leg lameness can come from many areas.

Paw and nail

Your vet may check for:

• Broken nails
• Cut pads
• Thorns
• Grass seeds
• Swelling between the toes
• Burns
• Foreign bodies
• Painful toes

A paw problem can look like a knee or hip problem, especially if the dog refuses to put the foot down.

Hock

The hock is the joint above the paw. Problems here can include sprains, fractures, arthritis, tendon injury or Achilles tendon problems.

Knee or stifle

The dog’s knee is called the stifle. It is one of the most common sources of back leg lameness.

Stifle problems may include:

• Cranial cruciate ligament disease
• Meniscal injury
• Patellar luxation
• Arthritis
• Trauma
• Growth related problems in young dogs

Hip

Hip problems may cause:

• Bunny hopping
• Difficulty rising
• Reluctance to jump
• Back leg stiffness
• Pain when the hip is extended
• Reduced muscle over the hindquarters

Hip dysplasia, hip luxation and arthritis can all cause back leg lameness.

Spine and nerves

Spinal or nerve related problems can cause:

• Wobbliness
• Toe dragging
• Weakness
• Back pain
• Reluctance to move
• Sudden paralysis in severe cases
• Loss of bladder or bowel control in serious cases

Intervertebral disc disease can cause back pain, hind leg weakness, loss of motor control, paralysis and incontinence in severe cases. Diagnosis may require X rays, myelography, CT or MRI.

Step 5: How the Examination Guides The Next Step

By this stage, your vet is not simply asking, “Which leg is sore?”

They are trying to narrow the problem into a likely category. Is this most consistent with a paw injury, joint problem, muscle or tendon injury, neck or back pain, neurological disease, infection, immune mediated disease, or something more complex?

The examination helps your vet decide:

• Whether the problem is likely to be orthopaedic, neurological or systemic
• Whether one leg, multiple legs, the spine or the whole body is involved
• Whether pain, weakness, incoordination, swelling, instability or fever is present
• Whether your dog needs rest and medication, imaging, blood tests, joint fluid testing or referral
• Whether the situation is urgent

This is why a lameness examination often includes more than the sore leg. Your vet may also assess the spine, neck, neurological function, temperature, general comfort, appetite and overall health.

A dog with a sore cruciate ligament may need a knee workup. A dog with toe dragging may need a neurological assessment. A dog with shifting leg lameness, fever or multiple painful joints may need tests for infection or immune mediated disease.

The next step depends on what the examination suggests.

Step 6: Diagnostic Tests for Dog Lameness

Not every lame dog needs every test.

Some dogs can be assessed with history, gait assessment and a hands on examination. Others need further diagnostics to confirm the cause, rule out serious disease, plan treatment, or decide whether referral is needed.

The right test depends on what your vet finds during the examination.

X rays

X rays, also called radiographs, are commonly used when your vet needs to assess bones and joints.

They may be recommended if your dog:

• Has severe or persistent lameness
• Cannot put weight on the leg
• Has had trauma
• May have a fracture or dislocation
• Has suspected arthritis
• Has suspected hip dysplasia
• Has suspected elbow, shoulder, knee, hock or hip disease
• May need surgery
• Has a possible bone tumour or bone infection

X rays are very useful for bones, joint alignment, arthritis, fractures, luxations and some developmental conditions.

However, X rays do not show every soft tissue injury. A cruciate ligament or meniscal injury may not be directly visible, although the X rays may show joint swelling, arthritis or changes that support the diagnosis.

Ultrasound

Ultrasound can be useful when your vet needs more information about soft tissues.

It may be considered for:

• Tendon injuries
• Muscle injuries
• Some ligament injuries
• Fluid around a joint or tendon sheath
• Abscesses or soft tissue swelling
• Guiding sampling in selected cases

Ultrasound does not replace a full orthopaedic or neurological examination, but it can help when the suspected problem involves soft tissue rather than bone.

CT

CT, or computed tomography, gives detailed cross sectional images and is especially useful for complex bone and joint problems.

It may be recommended when:

• X rays do not explain the lameness
• A complex fracture is suspected
• Elbow disease or shoulder disease is suspected
• A spinal problem needs further investigation
• Surgery is being planned
• More detail is needed than standard X rays can provide

CT is particularly helpful when vets need detailed information about bone structure, joint surfaces or surgical planning.

MRI

MRI, or magnetic resonance imaging, is often used when the concern involves the spinal cord, nerves, discs or complex soft tissue structures.

It may be recommended if your dog has:

• Neck pain
• Back pain
• Weakness
• Ataxia or wobbliness
• Toe dragging or knuckling
• Suspected intervertebral disc disease
• Signs suggesting spinal cord or nerve involvement

Intervertebral disc disease can cause severe pain, weakness, loss of motor control, paralysis and bladder or bowel problems. Advanced imaging such as MRI, CT or myelography may be needed when spinal cord disease is suspected or surgery is being considered.

Blood tests

Blood tests may be recommended when your vet is concerned that the lameness is not just a local leg injury.

They can be useful when there is:

• Fever
• Lethargy
• Reduced appetite
• Weight loss
• Multiple sore joints
• Shifting leg lameness
• Suspected infection
• Suspected immune mediated disease
• Concern about inflammation or systemic illness
• A need to check organ function before medication, sedation or anaesthesia

Blood tests do not diagnose every cause of lameness, but they can give important information about infection, inflammation, anaemia, organ function and overall health.

Urine tests

Urine testing may be recommended when systemic disease, infection, immune mediated disease, kidney function or medication safety needs to be assessed.

It can be especially useful when your dog is unwell as well as lame, or when blood tests suggest further investigation is needed.

Joint fluid testing

Joint fluid testing may be recommended if your vet suspects infection inside a joint or immune mediated joint disease.

This involves collecting a small sample of fluid from one or more joints, usually under sedation or anaesthesia.

Joint fluid testing can help assess:

• Septic arthritis
• Immune mediated polyarthritis
• Inflammatory joint disease
• Whether bacteria may be present
• The type and severity of joint inflammation

This is particularly important when a dog has swollen joints, fever, multiple painful joints, shifting leg lameness or severe stiffness.

Why your dog may need sedation or anaesthesia

Some lameness tests require your dog to stay very still. Others may be painful if the dog is tense or guarding.

Sedation or anaesthesia may be needed for:

• High quality X rays
• CT or MRI
• Joint fluid collection
• Some ultrasound procedures
• Detailed orthopaedic manipulation in a painful dog

This is not done lightly. It is used when it helps your vet get accurate information while reducing pain, stress and movement.

Which test is best?

There is no single best test for every lame dog.

Your vet will use the examination findings to choose the most useful test, rather than testing everything at once.

What Can I Do At Home While Waiting for Vet Advice?

If your dog is limping but otherwise bright and comfortable:

• Rest them
• Stop running, jumping and stairs
• Keep them on lead for toileting
• Check the paw and nails gently
• Take a short video of the limp
• Write down when it started
• Note whether it is worse after rest or exercise
• Book a vet check if it does not improve or keeps returning

Can I Give My Dog Panadol or Other Human Pain Relief?

Do not give your dog human pain medication unless a vet has specifically told you to.

Some human medications, including paracetamol, also known as Panadol or acetaminophen, may be used in dogs in specific situations under veterinary direction. However, the safe dose depends on the dog, the condition being treated, other medications, liver health, and whether there are any other risks.

Paracetamol should never be guessed or given repeatedly without veterinary advice. It is also extremely dangerous for cats.

Other human pain medications, especially ibuprofen and naproxen, can be very harmful to dogs and should not be given unless specifically prescribed by a vet.

If your dog is lame or painful, the safest next step is to speak with a vet so the cause of the pain is assessed and the right pain relief is chosen.

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Can an Online Vet Diagnose Lameness?

An online vet consult can often help you understand how serious the lameness may be, what signs to watch for, whether your dog needs urgent care, and what information to gather before seeing your local vet.

With a very good history it is often possible to receive a likely diagnosis, however, many lameness problems still need a hands on examination, and some require X rays or further tests.

At Your Vet Online, we can help you decide the next sensible step, especially if you are unsure whether your dog’s limp can wait or needs urgent veterinary attention.

Frequently Asked Questions About Lameness In Dogs

What should I do first if my dog suddenly starts limping?

Stop exercise, keep your dog quiet, check the paw and nails if it is safe, look for wounds or swelling, and take a short video of the limp. If your dog cannot put weight on the leg, is very painful, weak, wobbly, swollen, bleeding or unwell, contact a vet promptly. For a step by step home guide, read Dog Suddenly Limping: What To Do At Home And When To Call A Vet.

Why is my dog limping but not crying?

Dogs don’t always cry when they are sore. Some dogs show pain by slowing down, avoiding stairs, not jumping, sleeping more, licking a joint, or changing how they move. Some can be incredibly stoic, hence why it’s always appropriate to have your dog examined by a vet.

Can arthritis make my dog limp?

Yes. Arthritis can cause limping, stiffness after rest, difficulty rising, reluctance to jump and reduced activity. It can affect older dogs, but it can also occur in younger dogs after injury or developmental joint disease.

Why does my dog skip on one back leg?

Skipping on one back leg is commonly associated with patellar luxation, where the kneecap slips out of place and then returns. You can read more here: Why Is My Dog Skipping On One Back Leg?

Is toe dragging an emergency?

Toe dragging can suggest weakness, nerve dysfunction or spinal disease. It should be assessed promptly, especially if it appears suddenly, worsens, or is associated with wobbliness.

Should I rest my dog if they are limping?

Yes, rest is usually sensible while you arrange vet advice. Avoid running, jumping, rough play and stairs until you know what is wrong. Once a diagnosis is given, rest might actually be detrimental. It all depends on the diagnosis.

Does my dog need X rays for a limp?

Some dogs with lameness will require xrays. X rays are often recommended when the lameness is severe, persistent, traumatic, painful, or when a fracture, dislocation, arthritis, hip problem or joint disease is suspected. Vets will often recommend xrays if there is suspicion of cancer.