Cruciate Ligament Injuries in Dogs: Signs, Treatment, Surgery Costs and Recovery

This article was reviewed by Small Animal Specialist Dr Sonya Wasik BVSc (Hons), BSc (Hons), MANZCVS, Dipl. ECVS, Registered Specialist in Small Animal Surgery at Melbourne Veterinary Orthopaedics. Sonya focuses on the management of cruciate ligament disease, complex fracture repair, joint stabilisation, and revision procedures.

If your dog has suddenly started limping on a back leg, is struggling to get up, or came home lame after running or playing, a cruciate ligament injury may be one of the conditions your veterinarian considers.

Often called an ACL injury in dogs, the condition is more accurately known as cranial cruciate ligament (CCL) disease. It is one of the most common orthopaedic problems affecting dogs and can range from subtle, intermittent lameness to a complete ligament rupture that significantly affects a dog’s ability to walk comfortably.

But there’s something many dog owners don’t realise.

Unlike the sudden sporting ACL injuries commonly seen in people, cruciate ligament problems in dogs are often not caused by one dramatic accident. In many cases, the ligament has been gradually weakening for weeks or months before the day a dog suddenly becomes noticeably lame.

That distinction matters, particularly for owners who blame themselves because their dog became lame after chasing a ball, jumping from the car or simply tearing around the backyard.

In this guide, we take an in-depth look at cranial cruciate ligament disease in dogs, including the early signs owners can easily miss, why some dogs may be more susceptible, how the condition is diagnosed, treatment and surgical options, the cost of cruciate ligament treatment in Australia, recovery after surgery and what owners can do to support long-term joint health.

We also speak with Dr Sonya Wasik BVSc (Hons), BSc (Hons), MANZCVS, Dipl. ECVS, Registered Specialist in Small Animal Surgery at Melbourne Veterinary Orthopaedics, to help explain what is actually happening inside the knee, and what owners need to know following a cruciate ligament diagnosis.

The 30-Second Answer: What Is a Cruciate Ligament Injury in Dogs?

The cranial cruciate ligament is an important ligament that helps stabilise a dog’s knee, known as the stifle joint.

When this ligament becomes damaged, partially tears or completely ruptures, the knee can become unstable. This instability can cause pain, inflammation and lameness and may contribute to the development and progression of osteoarthritis within the affected joint.

Some dogs suddenly refuse to put weight on the affected back leg. Others show much less obvious symptoms, such as an occasional limp, stiffness after resting, sitting differently or hesitating before jumping into the car.

Although owners often associate the problem with a particular incident, such as running, slipping or jumping, canine cruciate ligament disease commonly involves gradual degeneration of the ligament over time.

Treatment depends on the individual dog and the severity of the condition. Surgical stabilisation is commonly recommended for appropriate patients, while conservative management may be considered in selected cases.

Pet Insurance Australia has seen ACL claim costs exceed $23,000* for maximum claims, with an average claim amount of $400+.

Is an ACL Injury the Same as a Cruciate Ligament Injury in Dogs?

Almost, but there is an important terminology difference.

Humans have an anterior cruciate ligament (ACL) in the knee. Dogs have the equivalent structure, called the cranial cruciate ligament (CCL).

This is why dog owners commonly search for terms such as “dog ACL injury”, “torn ACL in dogs” or “dog ACL surgery”. Your veterinarian, however, is more likely to refer to the condition as a cranial cruciate ligament injury, CCL rupture or cranial cruciate ligament disease.

The ligament sits within the dog’s stifle joint and plays an essential role in keeping the knee stable during movement and weight-bearing.

When it stops functioning properly, abnormal movement can occur between the tibia (shin bone) and femur (thigh bone). This instability causes inflammation and discomfort and can progressively damage other structures within the joint.

One of those structures is the meniscus, a piece of cartilage that helps absorb shock within the knee. Meniscal damage can occur alongside cruciate ligament disease and may further contribute to pain and lameness.

Do Dogs Suddenly Tear Their Cruciate Ligament?

This is where canine cruciate disease becomes particularly interesting, and where one of the biggest misconceptions exists.

Picture a dog racing after a ball at the park. They turn sharply, yelp, and suddenly come back holding one back leg off the ground.

It is completely understandable for an owner to assume:

“They’ve torn their cruciate chasing that ball.”

But that final run may only be part of the story.

According to Dr Wasik, most canine CCL injuries are the end result of a gradual degenerative process within the ligament. Early on, only a small number of ligament fibres may be damaged. This can create inflammation and soreness without necessarily making the knee obviously unstable.

The dog might limp slightly for a day or two and then appear completely normal again.

Weeks later, it happens again.

Eventually, as more fibres become damaged and the ligament progressively weakens, a partial or complete rupture can occur, and the knee may become sufficiently unstable to cause much more obvious and persistent lameness.

“Owners will often remember the exact moment their dog became severely lame and some owners can be very upset with themselves (eg if they were the one who threw the ball, or let the dog jump out of the car rather than lifting) as they wrongly assume that one specific event has caused the entire problem,” Dr Wasik’s explains. “In reality, this is seldom the case as the ligament has likely been degenerating for a period of weeks to months already.”

This also explains why cruciate ligament disease isn’t necessarily something owners can prevent simply by stopping their dog from running, jumping or playing.

For some dogs, the final rupture can happen during a completely ordinary movement, even something they have safely done hundreds of times before.

Dr Wasik notes that dogs can become significantly lame after activities ranging from chasing a ball or boisterous play to something as everyday as jumping down from a couch or bed. Yet the underlying changes within the ligament may have begun well before that moment.

What Causes Cruciate Ligament Disease in Dogs?

There isn’t one single cause.

Current understanding of canine CCL disease points towards a multifactorial process, meaning several factors may contribute to why the ligament degenerates or ultimately fails.

These can include:

• genetics and breed predisposition
• the individual dog’s anatomy and limb conformation
• knee joint geometry
• body weight and body condition
• age
• muscle condition
• hormonal factors
• the underlying biological health of the ligament

This is also why two seemingly similar dogs can have very different experiences. One dog may remain unaffected throughout life, while another develops cruciate disease despite being active, fit and otherwise healthy.

And once instability develops, there can be consequences beyond the original ligament.

An unstable knee changes the normal mechanics of the joint. This can perpetuate inflammation and pain, contribute to progressive osteoarthritis and potentially damage the meniscus.

That makes recognising the early warning signs particularly important. And those signs aren’t always the dramatic, three-legged limp owners expect. In fact, the first clues that something isn’t right can be surprisingly easy to miss.

What Are the Early Signs of Cruciate Ligament Disease in Dogs?

Not every cruciate ligament problem begins with a dog suddenly refusing to use a back leg; some of the earliest signs can be remarkably easy to dismiss.

A dog may limp slightly after exercise, appear stiff when getting out of bed or hesitate before jumping into the car. After a little rest, they seem fine again, so it’s natural to assume they’ve overdone it, pulled a muscle or landed awkwardly.

But when these seemingly minor episodes keep returning, they deserve attention.

Dr Wasik says the first signs of cranial cruciate ligament disease can be surprisingly subtle, particularly when the ligament is only partially damaged.

Early signs of a cruciate ligament problem can include:

• An intermittent limp affecting one of the back legs
• Stiffness when first getting up after sleeping or resting
• Limping after exercise but appearing relatively normal during activity
• Sitting with one or both hind legs positioned out to the side rather than sitting squarely
• Hesitating or becoming reluctant to jump into the car or onto furniture
• Less enthusiasm for usual walks
• Sitting down or wanting to stop during a walk they would normally complete
• Appearing sore or lame after running, playing or exercising
• Recurrent episodes of hindlimb lameness that improve with rest before returning

One particularly important clue is a pattern of lameness that seems to disappear and then comes back.

In the early stages of CCL disease, some fibres within the ligament may be damaged while enough of the ligament remains intact to maintain reasonable stability within the knee. A few quieter days can make the inflammation and soreness settle, giving the impression that whatever was wrong has healed. The underlying ligament problem, however, may still be present.

“Some dogs develop a very slight, intermittent hindlimb limp that seems to improve or spontaneously resolve after a few days of rest, only to return again at a later time once activity is reintroduced.”

This is why repeatedly writing off a mild back-leg limp as a pulled muscle can potentially delay diagnosis.

As Dr Wasik explains, persistent or recurrent hindlimb lameness warrants veterinary investigation. Earlier assessment gives vets an opportunity to identify what is happening before prolonged knee instability and secondary joint changes develop.

Can a Dog Have a Cruciate Injury and Still Run and Play?

Yes…and this can make recognising a developing problem particularly difficult. A dog’s willingness to exercise isn’t necessarily a reliable measure of how comfortable their knee is. Dogs are also masters at masking pain, particularly if they want to indulge in their favourite activity – cue the frisbees and balls.

Some active, highly driven or working-type dogs will continue to chase balls, run, jump and play despite having a painful knee. They may look remarkably normal while caught up in the excitement of an activity, only to become noticeably stiff or lame once they stop.

Owners can understandably look at a dog racing around the park and think:

“If their knee really hurt, surely they wouldn’t be doing that?”

Unfortunately, that’s not always the case.

Dr Wasik says she commonly sees this scenario in dogs with partial CCL ruptures. The dog remains enthusiastic about activity, but afterwards the consequences become much more apparent through stiffness, soreness or lameness.

“Many active/working type dogs will not have their drive to be active/work or chase after balls of other dogs hampered by their sore knee, and will seem to run, jump or play as normal, but they will then pay for it afterwards by usually being quite lame, or stiff/sore once the activity stops.”

So rather than looking only at what your dog can physically do, pay attention to how they move and behave afterwards. A recurring post-exercise limp is worth mentioning to your veterinarian even if your dog appears eager to go again the following day.

Why Is My Dog Sitting With One Back Leg Out to the Side?

How your dog sits can also provide a clue that something is uncomfortable. A comfortable dog will often sit relatively squarely, with their hindquarters underneath them. Dogs experiencing knee discomfort may instead position one hind leg out to the side, avoiding full flexion of the affected joint.

This doesn’t automatically mean your dog has a cruciate ligament injury. Many factors can cause an altered sitting position. However, a new or persistent change in the way your dog sits, particularly when combined with limping, stiffness or reluctance to jump,  is useful information to give your veterinarian.

Sometimes the most valuable clues aren’t dramatic signs of pain. They’re simply changes from what is normal for your dog.

What Does a Complete Cruciate Ligament Rupture Look Like?

As cruciate disease progresses, the signs may become much more obvious. A dog that previously experienced occasional mild limping may suddenly develop significant lameness and struggle to put normal weight through the affected leg.

Depending on the individual dog and severity of the problem, owners may notice:

• Sudden significant hindlimb lameness
• Holding the affected back leg off the ground
• Difficulty getting up or moving comfortably
• Reduced willingness to walk
• Pain or obvious discomfort
• A substantial deterioration following exercise
• Loss of muscle from the affected hind leg over time

Severe mobility problems warrant veterinary attention, while sudden significant lameness should not simply be assumed to be a cruciate injury; fractures, dislocations and other painful conditions can cause similar signs.

When Should I Take My Limping Dog to the Vet?

A dog that suddenly develops severe lameness, appears to be in significant pain or cannot comfortably use a limb should be assessed promptly. But owners shouldn’t necessarily wait for symptoms to become severe.

One of the most useful messages from Dr Wasik’s advice is that recurrent minor lameness matters too.

If your dog develops a back-leg limp that keeps disappearing and returning, becomes repeatedly stiff after exercise, changes the way they sit or begins hesitating before activities they previously performed comfortably, arrange a veterinary examination.

Keeping a simple record can also be useful. Note when the lameness occurs, how long it lasts and whether particular activities seem to make it worse. A short video of your dog walking or displaying the abnormal movement at home may also help demonstrate what you’ve been seeing if they happen to move normally once they reach the clinic.

The goal isn’t to diagnose a cruciate injury yourself. It’s to recognise that a recurring change in your dog’s movement deserves investigation. Because once cruciate disease is suspected, the next question is usually:

Why did this happen to my dog — and are some dogs more at risk than others?

Which Dogs Are Most at Risk of Cruciate Ligament Disease?

Cranial cruciate ligament disease can affect dogs of any breed or size, but some breeds appear more susceptible than others.

In her own orthopaedic caseload, Dr Sonya Wasik says Labrador Retrievers, Golden Retrievers and Staffordshire Bull Terriers are among the breeds she commonly treats for cruciate ligament disease. She also highlights Newfoundlands, which can present at a young age and may sometimes have both knees affected.

Breed alone doesn’t determine whether a dog will develop CCL disease. Genetics are thought to play an important role, while differences in limb conformation and knee geometry can also influence the forces placed on the ligament.

As Dr Wasik explains:

“There isn’t a single reason; genetics appear to play an important role, while differences in limb conformation and individual stifle geometry, for example, dogs that have a steep or excessive tibial plateau angle, can influence the forces placed on the ligament.”

Interestingly, she notes that Greyhounds and other Sighthounds appear to be rarely affected compared with some of the breeds she commonly sees.

Can Small Dogs Get Cruciate Ligament Injuries?

Yes. Cruciate ligament disease isn’t limited to large dogs.

Dr Wasik also performs cruciate surgery in small breeds and notes that, within the small dogs she personally sees, around half have concurrent medial patellar luxation, where the kneecap moves out of its normal position.

When both conditions are present, the patellar luxation may need to be addressed as part of the dog’s treatment plan.

“I do seem to undertake lots of cruciate ligament surgeries in small breed dogs too; probably 50% of cases that I personally see within this population have concurrent medial patellar luxation, which should be addressed at the same time.”

Can a Dog Rupture the Cruciate Ligament in Both Knees?

Yes. Once a dog develops CCL disease in one knee, there is a significant risk that the opposite knee may eventually be affected.

Some dogs have problems in both knees at the same time, while others may have obvious lameness in one leg even though changes are also occurring in the other.

“In many dogs, both ligaments are undergoing the same underlying degenerative process at the same time, but perhaps at different rates.”

This doesn’t mean every dog diagnosed with a cruciate problem will eventually rupture both ligaments. Still, owners and veterinarians should continue to monitor the health and mobility of the opposite knee.

How Is a Cruciate Ligament Injury Diagnosed in Dogs?

Diagnosis usually begins with a veterinary examination of the dog’s gait, knee and overall hindlimb function. Veterinarians can assess the stifle for abnormal movement or instability associated with cruciate ligament insufficiency. Radiographs (X-rays) are also important for assessing the joint and its conformation and may be required for surgical planning.

In some cases, an examination under anaesthesia (EUA) can help identify knee instability that was difficult to detect while the dog was awake.

“Appropriately positioned radiographs are important for diagnostic purposes/assessment of conformation, as well as pre-surgical planning, templating and implant sizing,” Dr Wasik says.  “Concurrent examination under anaesthesia (EUA) is also crucial to determine level of stability and may detect subtle instability which wasn’t so obvious on the conscious examination.”

Other causes of hindlimb lameness can produce similar symptoms, so veterinary assessment matters rather than assuming a back-leg limp automatically means a cruciate injury.

Once CCL disease has been diagnosed, the next decision is how best to manage the affected knee.

And despite what owners may find after a frantic Google search, no single cruciate treatment or surgical procedure is right for every dog.

How Are Cruciate Ligament Injuries Treated in Dogs?

Once a veterinarian diagnoses cranial cruciate ligament disease, treatment depends on the individual dog.

No single operation or treatment plan is automatically right for every patient. A veterinarian or surgeon may consider the dog’s size, age, activity level, knee stability, conformation and any other medical or orthopaedic conditions before recommending an approach. Treatment may involve conservative management in selected cases or surgical stabilisation of the knee.

“There is no single operation that is automatically best for every dog; the fact that multiple different surgical techniques exist to manage this condition confirms this.”

Can a Dog Recover From a Cruciate Ligament Injury Without Surgery?

Conservative, or non-surgical, management may be considered for some dogs and should be discussed with your veterinarian.

Whether it is appropriate depends on the individual patient and the nature of their cruciate disease. Management may involve controlled activity, weight management, pain relief or anti-inflammatory medication when prescribed, and rehabilitation under veterinary guidance.

However, when the cruciate ligament is no longer functioning adequately, the knee can remain mechanically unstable. For many dogs, surgery may therefore be recommended to stabilise the joint and support a return to comfortable function.

What Surgery Is Used for Cruciate Ligament Injuries in Dogs?

Several surgical techniques are available, which is another reason owners may encounter very different terminology when researching cruciate treatment.

For many medium and large dogs, Dr Wasik says osteotomy procedures such as a tibial plateau levelling osteotomy (TPLO) can provide predictable outcomes. Other procedures, including extracapsular stabilisation, may suit selected patients, including some smaller or less active dogs.

What Is TPLO Surgery?

TPLO is one of the commonly performed surgeries used to treat cranial cruciate ligament disease in dogs.

One important thing to understand is that TPLO doesn’t simply stitch the damaged cruciate ligament back together. Instead, the procedure changes the knee’s biomechanics.

During TPLO surgery, the surgeon makes a controlled cut in the upper portion of the tibia and alters the angle of the tibial plateau. The bone is then stabilised in its new position using a specialised plate and screws.

This changes the forces acting through the knee during weight-bearing, allowing the joint to function more effectively despite the damaged cruciate ligament.

“Procedures like TPLO are biomechanical corrections, which serve to functionally stabilise the knee during weight-bearing in the absence of a cruciate ligament.”

How Does a Vet Decide Which Cruciate Surgery Is Best?

Breed or body weight alone doesn’t determine the most appropriate procedure. Vets combine radiographs, examination findings, and surgical planning with factors such as the dog’s lifestyle, anatomy, and degree of instability.

The surgeon’s experience and training are also relevant.

For owners, this means two dogs with the same diagnosis may not necessarily receive the same treatment recommendation.

The aim is not simply to make the dog capable of walking again. The longer-term goal is to restore comfortable function appropriate to that individual dog, whether that’s returning to work or agility, running at the park, or simply enjoying normal life.

Because cruciate surgery can involve specialised imaging, equipment, implants, and considerable surgical planning, treatment can be a significant veterinary expense.

So, how much can treating a cruciate ligament injury actually cost?

How Much Does Cruciate Ligament Surgery Cost for Dogs in Australia?

The cost of treating a cruciate ligament injury can vary considerably between dogs because “cruciate surgery” isn’t one single procedure.

The dog’s size, surgical technique, degree of knee instability and whether there is additional damage — such as a meniscal injury — can all influence the final cost. Other orthopaedic conditions may also need to be addressed.

Treatment costs can include diagnostic imaging, anaesthesia, specialised surgical equipment and implants, hospitalisation, medications and follow-up radiographs.

“Factors such as the dog’s size and age, the degree of instability, whether the meniscus is damaged, the surgical technique chosen and the presence of other orthopaedic problems, such as medial patellar luxation, angular deformities etc., all influence treatment.”

What Do Cruciate Ligament Claims Cost?

Pet Insurance Australia claims data provides an insight into just how costly cruciate ligament problems can become.

According to PetSure, Pet Insurance Australia’s underwriter, over the past 24 months:

• Cruciate ligament trauma: the average claim was $556, while the highest claim reached $26,751.*
• Cruciate ligament disease: the average claim was $419, with the highest claim reaching $19,012.*

While average claims may seem modest, the highest claims show how costs can escalate in complex cases.

These figures represent pet insurance claims, not the total cost of treatment. The amount an individual owner may face depends on their dog’s condition, the treatment required, and their veterinary provider.

*PetSure claims data for Pet Insurance Australia, previous 24 months.

Why Can TPLO Surgery Be Expensive?

TPLO is a technically complex orthopaedic procedure that requires specialised equipment, surgical expertise, and implants designed to stabilise the bone after the tibia has been repositioned.

Dr Wasik describes cruciate stabilisation procedures as “equipment heavy”, requiring considerable surgical inventory alongside appropriate training and expertise.

The goal extends beyond simply getting a dog back onto four legs. Successful treatment aims to restore comfortable, functional movement appropriate to the individual dog.

But surgery itself is only part of the process.

What happens during the following eight to twelve weeks can be just as important to a dog’s recovery.

What Is Recovery Like After Cruciate Ligament Surgery?

Recovery from cruciate ligament surgery is gradual, even when a dog appears to feel dramatically better soon after the procedure.

Some dogs begin using the operated leg on the day of surgery or the following day, while others may take several days. By around the two-week postoperative check, Dr Wasik says most dogs are using the operated leg to some degree.

The challenge is that feeling better doesn’t mean the surgical site has fully healed.

“This can actually create one of the biggest challenges of post-surgical recovery and rehabilitation: the dog often feels better before the surgery site has completely healed and can feel tempted to overdo it physically.”

During the initial recovery period, dogs generally need carefully restricted activity. Dr Wasik recommends keeping dogs rested and confined to a small, secure area or crate when they cannot be directly supervised during the first eight weeks.

Exercise is typically limited to controlled, short leash walks, with running, jumping, stairs, rough play and unrestricted activity avoided while healing takes place.

For procedures involving an osteotomy, such as TPLO, follow-up radiographs can help assess bone healing before gradually increasing activity.

How Long Does Recovery From Cruciate Surgery Take?

Depending on the procedure and individual dog, rehabilitation commonly takes around eight to twelve weeks, although rebuilding lost muscle strength can take several months.

One of the biggest mistakes owners can make is allowing too much activity too soon.

“A dog that suddenly feels dramatically better with a stable knee joint at four weeks does not necessarily have a fully healed tibia by that time, and catastrophic complications (such as implant failure, fracture of the tibia/tibial tuberosity/patella) can occur.”

Following the rehabilitation plan your veterinary team provides is important, even when your dog seems ready to do much more.

Can Cruciate Ligament Disease Be Prevented?

There is no guaranteed way to prevent CCL disease, particularly in dogs with an underlying predisposition.

However, maintaining a healthy body weight and good muscle condition is one practical area owners can influence.

Excess weight adds load to weight-bearing joints and can make movement harder for dogs already dealing with an unstable or arthritic knee. Keeping dogs lean is also valuable during rehabilitation.

Owners can also address recurring mobility changes rather than waiting for major deterioration. If your dog repeatedly develops unexplained hindlimb lameness, speak with your veterinarian.

A cruciate diagnosis can sound daunting, particularly when surgery is recommended, but the outlook for appropriately treated dogs can be very positive.

As Dr Wasik explains:

“The overwhelming majority of appropriately treated dogs can return to an excellent quality of life.”

With an appropriate treatment plan, good postoperative care and a committed recovery period, many dogs can return to comfortable, active lives.

Frequently Asked Questions About Cruciate Ligament Injuries in Dogs

Can a dog walk with a torn cruciate ligament?

Yes, some dogs can still walk, and even run or play, with a damaged or partially torn cranial cruciate ligament. Others may develop significant lameness or avoid putting weight on the affected leg. A dog’s willingness to use the leg doesn’t necessarily indicate how serious the problem is, so a veterinarian should assess persistent or recurring hindlimb lameness.

Does a torn cruciate ligament in a dog always need surgery?

Not always. Conservative management may be considered for selected dogs, while surgery may be recommended when the knee is unstable, or the condition significantly affects comfort and function. The best approach depends on factors including the dog’s size, age, activity level, anatomy and degree of joint instability.

What happens if a dog’s cruciate ligament injury is left untreated?

An incompetent cranial cruciate ligament can leave the knee mechanically unstable. According to Dr Wasik, this instability can perpetuate pain and inflammation and contribute to progressive osteoarthritis. The medial meniscus within the knee can also become damaged. Owners should discuss treatment options and likely outcomes with their veterinarian.

How long does it take a dog to recover from cruciate ligament surgery?

Recovery varies by procedure and individual dog, but Dr Wasik says rehabilitation commonly lasts about eight to twelve weeks. Rebuilding lost muscle mass and strength may take several months. Increase activity only according to the postoperative plan provided by the dog’s veterinary team.

Can a dog tear the cruciate ligament in the other leg?

Yes. Dogs diagnosed with CCL disease in one knee can also develop problems in the opposite knee. Dr Wasik explains that, in many dogs, both ligaments may be undergoing the same underlying degenerative process at the same time but at different rates.

Can cruciate ligament injuries in dogs be prevented?

There is no guaranteed way to prevent cranial cruciate ligament disease, particularly when a dog is genetically predisposed. Maintaining a healthy body weight and good muscle condition can help reduce unnecessary load on the joints. Also investigate recurring hindlimb lameness rather than repeatedly assuming it’s a minor strain.

This article provides general information only and is not a substitute for veterinary advice. If your dog is limping, experiencing pain or showing changes in mobility, speak with your veterinarian.

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