Cruciate Ligament Tear in Dogs: Signs, Surgery and Recovery

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

A dog who yelps, holds up a back leg and then limps for days may have torn a cruciate ligament.

What it is

The cranial cruciate ligament, similar to the ACL in people, holds the thigh bone and shin bone together and prevents the shin from sliding forward. When it tears, the knee becomes unstable, causing pain, inflammation and joint damage including meniscus tears.

How tears happen

In many dogs the ligament weakens gradually through degeneration, and a normal movement such as a sudden turn causes the final tear. Risk factors include being overweight, certain breeds such as Labradors, Rottweilers, Newfoundlands and Staffordshire bull terriers, neutering at a young age in some breeds, poor conditioning and luxating patella. See luxating patella in dogs.

Signs

• Sudden lameness after running or jumping, or a gradual limp that worsens
• Sitting with one leg out to the side
• Stiffness after rest
• Swelling on the inside of the knee
• Reluctance to jump or climb
• Clicking sound if the meniscus is torn

See why is my dog limping.

Diagnosis

Your vet will perform an orthopedic exam, including drawer and tibial thrust tests, which may need sedation. X-rays show joint swelling and rule out other problems, such as bone tumors.

Treatment

• Surgery: TPLO (tibial plateau leveling osteotomy), TTA (tibial tuberosity advancement) or lateral suture techniques. The best choice depends on size, age and surgeon experience.
• Conservative management: for some small or non-surgical candidates, with rest, weight control, physical therapy and pain medication
• Pain relief and anti-inflammatories as prescribed
• Rehabilitation after surgery

Recovery timeline

Expect strict restriction for the first several weeks: leash-only toilet breaks, no running or jumping and a cone to prevent licking. Physical therapy typically begins as advised. Many dogs return to normal activity in around three to four months, though full strength can take longer. See dog stitches and incision care and dog cone alternatives.

Supporting recovery at home

1. Use non-slip floors and ramps.
2. Keep your dog confined to a crate or small room when unsupervised.
3. Follow the rehab schedule exactly.
4. Control weight.
5. Attend rechecks and X-rays.

The other knee

Many dogs rupture the opposite ligament in the following year or two. Keeping your dog lean and fit helps protect it.

Common mistakes

• Returning to play too early
• Skipping rehab
• Letting weight rise
• Assuming it is just a sprain

Troubleshooting

• My dog limps again after improving: contact your surgeon.
• The incision looks red or swollen: call your vet.
• My dog is chewing the stitches: use a cone.

A simple plan

1. Get a diagnosis.
2. Choose surgery or management.
3. Follow rehab.
4. Protect the other knee.

Real-life examples

A lab has TPLO surgery and returns to swimming after four months. A small terrier is managed conservatively and recovers with rest and weight loss. A Rottweiler tears the second knee a year later and benefits from a better conditioning program. Individual results vary.

Planning ahead

Ask about costs, insurance and aftercare before surgery. See dog pet insurance guide.

Questions for your surgeon

Ask which technique they recommend and why, how many of these procedures they perform each year, what the complication rate is, what the aftercare costs and how the rehabilitation will be handled. Ask what to do if the incision looks swollen or your dog starts limping again, and who to call out of hours.

Meniscus injuries

A torn meniscus often accompanies a cruciate rupture and can cause a clicking sound and ongoing pain even after stabilization. Your surgeon may inspect and treat the meniscus during surgery. If a dog improves after surgery and then suddenly worsens, a late meniscal tear is one possible cause to discuss.

The takeaway

Cruciate tears are common and treatable. Surgery plus careful rehab gives most dogs a good outcome.

This article is general educational information, not veterinary advice. Every dog is different. If your dog is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.