Achilles Tendon Injuries in Dogs: Signs and Recovery

Most hind limb lameness in dogs comes from the knee or the hip, and most owners have heard of cruciate ligament injury and hip dysplasia. Far fewer have heard of the Achilles tendon — properly the common calcaneal tendon — even though injuries to it produce one of the most visually distinctive abnormalities in all of small animal orthopaedics.

The giveaway is the stance. A dog with a significantly compromised Achilles tendon cannot hold the hock, the joint that corresponds to the human ankle, in its normal upright position. The hock sinks toward the ground and the dog stands and walks with the hind foot flattened along its length, a posture veterinarians describe as plantigrade. Once you have seen it, it is unmistakable.

This guide explains what the tendon does, how it gets injured, what partial and complete injuries look like, how the diagnosis is made, and what recovery realistically involves. Achilles injuries generally need surgical or specialist management, and a long, disciplined recovery, so early recognition genuinely changes outcomes.

Important: This article shares general educational information for pet owners and is not a substitute for an in-person veterinary examination, diagnosis, or treatment. For any medical concern or emergency, contact your veterinarian promptly.

What the Achilles Tendon Does

The common calcaneal tendon is the strongest tendon in the dog's body. It is not a single structure but a group of tendons from several muscles of the back of the thigh and lower leg, converging to attach to the point of the hock — the calcaneus, which is the equivalent of the human heel bone.

Its job is to extend the hock, driving the leg backwards during propulsion. Every push-off, jump, sprint and hill climb depends on it. It also plays a major role in simply maintaining the normal standing posture of the hind limb, keeping the hock upright and the foot positioned correctly.

Because the tendon group contains several components, injuries are not all-or-nothing. Some parts can rupture while others remain intact, which produces a partial injury with a characteristic and rather odd appearance. That variability is a large part of why these injuries need proper assessment rather than guesswork.

How These Injuries Happen

Achilles injuries in dogs arise in two broad ways, and the distinction affects both presentation and management.

• Acute traumatic injury — a sudden laceration, often from glass, metal or wire at the back of the hock, or a sudden rupture during intense exercise. These cases have an obvious onset and the owner usually knows something happened.
• Chronic degenerative injury — gradual weakening and progressive failure of the tendon over time, often without any single dramatic event. The dog's stance changes slowly, and owners frequently report that they noticed it 'looked different' for weeks before seeking help.

Degenerative injury is well recognised in middle-aged to older dogs, and certain breeds are mentioned repeatedly in the veterinary literature, particularly Dobermanns and Labrador Retrievers. Active working and sporting dogs are over-represented in traumatic injuries, as are dogs who exercise explosively on uneven or slippery ground.

Wounds at the back of the hock deserve particular caution. The tendon lies close to the skin surface there, with very little tissue covering it, so a cut that looks superficial can involve the tendon underneath. Any laceration in this area should be examined by a veterinarian rather than cleaned and dressed at home.

Recognising the Signs

The stance abnormality is the most reliable indicator, and it varies with how much of the tendon group is affected.

What to look for

• Dropped hock — the point of the hock sits lower than normal, and in complete injuries the whole foot may lie flat on the ground when standing.
• Curled toes with a dropped hock — the classic appearance of a partial injury, where the hock sinks but the toes flex downward, sometimes described as a crab-like stance.
• Lameness — ranging from subtle to non-weight-bearing depending on severity and how recent the injury is.
• Swelling at the back of the hock — thickening, heat or a palpable change along the tendon.
• Pain on handling — reluctance or discomfort when the area is touched or the hock is flexed.
• A wound over the tendon — any cut at the back of the hock, however small it appears.
• Reduced performance — in sporting dogs, a loss of push-off power or reluctance to jump may come before obvious lameness.

Compare the two hind legs from behind and from the side while your dog stands squarely. Asymmetry in hock height is often easier to see than to describe, and a short video of your dog walking and standing is extremely helpful for your veterinarian.

Why It Needs Prompt Attention

Tendon injuries do not simply heal with time and rest in the way many soft tissue strains do. The tendon is under constant tension, and once its fibres are disrupted, that tension pulls the ends apart. Left alone, the gap fills with disorganised scar tissue that is longer and weaker than the original structure.

The practical result is a tendon that never regains normal length or strength, leaving a permanently altered stance and gait. Chronic cases are also harder to repair surgically, because the tissue quality is poorer and the muscles have shortened or weakened in the meantime.

There is a secondary problem too. A dog walking with the hock dropped bears weight on skin that was never designed for it, and pressure sores over the back of the hock are common in untreated cases. Early diagnosis simply gives more options and better ones.

How Veterinarians Assess It

Assessment starts with watching the dog stand and walk, then a careful orthopaedic examination comparing both hind limbs. Your veterinarian will palpate along the tendon feeling for thickening, gaps, heat or pain, and will assess how the hock and stifle move and whether the hock can be flexed further than normal.

Imaging follows. Radiographs assess the calcaneus and surrounding bone, show soft tissue swelling, and identify any bone fragments pulled off at the attachment. Ultrasound is particularly useful for soft tissue, allowing the tendon fibres to be visualised and the extent of disruption assessed. MRI provides the most detailed view and may be used in complex or referral cases.

Because several conditions can cause a dropped hock or hind limb weakness, your veterinarian will also consider alternatives — including neurological causes, other orthopaedic injuries and certain metabolic conditions. Tell them about the onset, whether there was a known incident, what your dog's exercise routine involves, and any previous lameness on that leg.

Treatment Options

Management depends on whether the injury is partial or complete, acute or chronic, and on the individual dog. Most significant Achilles injuries in dogs require surgical repair, and referral to a veterinary orthopaedic surgeon is common.

Surgery typically involves reapposing the torn tendon ends and then protecting that repair while it heals, since the repair itself cannot withstand normal tension in the early weeks. Protection may be achieved with external support such as a cast, splint or specialised brace, or with implants placed to temporarily immobilise the hock. Your surgeon will explain which approach they recommend and why.

Conservative management with immobilisation alone is used in some selected cases — certain partial injuries, or dogs where anaesthesia carries unacceptable risk. It requires strict, prolonged immobilisation and close monitoring. This is a decision for your veterinarian based on the specific injury, not a home alternative to be chosen on cost grounds without discussion.

Recovery Is Long — Plan for It

This is the part owners most need to understand before treatment begins. Tendon healing is slow, and Achilles recovery in dogs is measured in months rather than weeks. Protocols commonly involve an extended period of immobilisation followed by a carefully staged return to function, with the total course frequently running to several months.

Activity restriction during this period is absolute, not approximate. No jumping, no stairs, no running, no slippery floors, no off-lead exercise. Controlled lead walks are introduced only when and as your surgeon directs, and increased only on their schedule. Re-rupture caused by a single enthusiastic moment is a well-recognised and heartbreaking complication.

Practical preparation makes compliance far easier. Set up a confined recovery area, put down non-slip runners on hard floors, block stair access, use a ramp for the car, and arrange a harness or sling for support if advised. Deciding how you will manage a bored, recovering dog before surgery is much better than improvising afterwards.

Bandage, Cast and Wound Care at Home

Many dogs come home with a cast, splint or bulky bandage, and complications with external support are one of the more common reasons for unplanned rechecks. Daily vigilance from owners genuinely prevents problems.

• Keep it completely dry — use a waterproof cover for toilet trips and remove it immediately afterwards, since moisture becomes trapped and condenses under a permanently covered limb.
• Check the toes daily — swelling, coldness, spreading of the toes or a change in colour needs same-day veterinary contact.
• Smell it — any unpleasant odour suggests a problem underneath and needs checking.
• Watch for chewing or licking — a dog interfering with the dressing usually means discomfort; use the prescribed collar and tell your vet.
• Watch for slipping or rubbing — a dressing that has moved can cause pressure sores rapidly.

Never attempt to adjust, re-wrap or remove a cast or splint yourself. If anything seems wrong, contact the practice — they would far rather check an intact dressing than deal with the consequences of one that failed unnoticed.

Rehabilitation and Getting Function Back

Formal rehabilitation makes a substantial difference to outcomes after tendon surgery. A prolonged period of immobilisation causes muscle loss and joint stiffness, and structured therapy addresses both while respecting the healing tendon.

Veterinary physiotherapy may include controlled passive movement, targeted strengthening exercises, hydrotherapy in an underwater treadmill once the wound and repair allow it, and manual therapy. All of it should be delivered or directed by a qualified veterinary rehabilitation professional working with your surgeon, and only within the timeline they set.

Keeping your dog at a lean, healthy body condition through the recovery is one of the most useful things an owner can do, since excess weight loads a healing tendon every time the dog stands. Discuss feeding with your veterinarian, as calorie needs drop considerably during confinement. Joint or mobility supplements are sometimes used as part of general support in recovering dogs; products such as MetaPet's Hip & Joint Drops for Dogs are formulated to support normal joint function and mobility as part of a daily routine. They are a complement to veterinary care, not a treatment for a tendon injury, and should only be used after discussing them with your veterinarian.

Outlook and Reducing Future Risk

With appropriate surgical repair, disciplined activity restriction and good rehabilitation, many dogs regain a functional, comfortable limb and return to normal daily life. Some retain a slightly altered stance or a mild reduction in athletic performance, and dogs with chronic degenerative injuries generally have a more guarded outlook than those with promptly treated acute injuries.

Complications are possible and worth knowing about in advance: infection, problems with implants or external supports, pressure sores, and re-rupture. Most are manageable when caught early, which is another argument for attending every scheduled recheck.

Prevention has limits, since not every injury is avoidable, but sensible measures help: maintain a lean body condition, build fitness gradually rather than asking for explosive effort from an unconditioned dog, warm up before intense activity, avoid repetitive high-impact work on slippery or uneven surfaces, and address any hind limb lameness early rather than assuming it will settle.

When to Contact Your Veterinarian

Hind limb lameness is common and not always urgent, but several findings should not wait.

If your dog has had surgery and something about the leg, the dressing or their comfort changes, contact your veterinary team straight away rather than waiting for the next appointment. Early intervention is almost always simpler than managing an established complication.