SYMPTOM
Clicking or popping leg joint
Owners often first notice a distinct clicking or popping sound coming from a leg, commonly the knee, as the dog walks, plays, or goes up and down stairs, sometimes well before any limp or reluctance to move is obvious.
Patellar Instability
In small and toy breeds such as the Yorkshire Terrier, Chihuahua, and Pomeranian, a shallow groove in the femur lets the kneecap slide sideways out of its normal track and back again, producing a click or a brief skip in the stride when it does so. This medial patellar luxation is graded I to IV according to whether the kneecap normally sits in its groove, slips out at times or stays out, and whether it can be pushed back. Milder grades can be present for months with only an intermittent skip or click before any consistent lameness develops. It is a common cause of a click from a hind leg in dogs of these body types.
Harmless Joint Noise
Not every click reflects joint disease. Some dogs make an occasional click or crack when they get up or stretch, with no pain, swelling or change in gait, and nothing abnormal is found when the joint is examined. It is often compared with knuckle-cracking in people. Dogs with this kind of click move, play and bear weight normally in between.
Hip Dysplasia
In larger and giant breeds such as the German Shepherd, Labrador, and Golden Retriever, a loosely fitting hip joint lets the head of the femur move more than it should within the socket. The hip can slip and settle back with a clunk or click, and as arthritis develops a grating feel (crepitus) can follow. Stretching the hip back, as when climbing stairs, is often uncomfortable. The condition typically stems from early skeletal growth abnormalities and becomes more apparent as secondary joint changes accumulate through adolescence.
Elbow Dysplasia or Osteochondritis Dissecans
Rapidly growing large-breed puppies between roughly six and nine months of age, with Labradors, Golden Retrievers, Rottweilers, and Bernese Mountain Dogs over-represented, can develop a cartilage flap or an incongruent elbow joint surface that catches during flexion and extension, producing an intermittent click most noticeable on the forelimb during play or after rest.
Cranial Cruciate Ligament Disease with Meniscal Injury
Once the cranial cruciate ligament in the stifle (knee) has partially or fully torn, a pattern common in middle-aged, overweight dogs and in breeds such as the Labrador and Rottweiler, the resulting joint instability can damage the C-shaped meniscal cartilage that cushions the joint. A torn fragment catching during weight-bearing produces the classic 'meniscal click', though this sound is reported in only a minority of confirmed meniscal tears, so its presence or absence is only a rough clue.
Why timing matters
Early observation
An occasional single click without any change in gait, particularly in a young toy-breed puppy, may reflect nothing more than a joint riding slightly loose without yet producing discomfort, consistent with a mild grade of patellar luxation.
Later presentation
A sound that becomes more frequent and starts to coincide with skipping or brief three-legged hopping suggests progression towards a higher luxation grade or an evolving joint problem, and benefits from characterisation via an orthopaedic assessment rather than continued observation alone.
Patellar luxation is graded I to IV, and hip and elbow dysplasia are scored from radiographs in the UK screening schemes, usually from 12 months of age. Higher grades and scores tend to go with more arthritic change later on. Because a grade is not a stage the joint passes through on a set timetable, the pattern of the sound over weeks says more than any single click.
Conditions commonly associated
Luxating Patella in Dogs
The kneecap tracking out of its groove, most often medially, is a common structural cause of a click from a hind leg, especially in small breeds.
Hip Dysplasia in Dogs
A loose hip joint in larger breeds can slip and settle back with a clunk or click, sometimes before any limp is obvious, and the arthritis that follows can add a grating feel (crepitus).
Elbow Dysplasia in Dogs
A poorly congruent elbow joint surface in growing large-breed puppies can catch during limb flexion, producing an intermittent click.
Osteochondritis Dissecans (OCD)
A flap of cartilage separated from the underlying bone in a rapidly growing joint can catch mechanically during movement, generating an audible click.
Cruciate Ligament Disease in Dogs
Instability from a torn cranial cruciate ligament changes how the stifle moves and predisposes to secondary meniscal injury, another source of clicking.
Meniscal Injury of the Stifle
A torn meniscal fragment catching between the femur and tibia during weight-bearing produces the classic 'meniscal click', though it is present in only a minority of confirmed tears.
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Osteoarthritis in Dogs
Chronic joint changes secondary to any of the above causes can produce ongoing crepitus that persists as background clicking or grinding independent of the original trigger.
Caudal Cruciate Ligament Injury
Damage to the caudal cruciate ligament can allow abnormal backward movement of the tibia during walking or standing, which may produce clicking sounds as the joint surfaces shift. Secondary meniscal injury, which can develop alongside caudal cruciate damage, may contribute further to audible joint noises.
When to explore further
A pop heard at the moment the dog yelped, twisted or landed badly, followed by holding the leg up, toe-touching or hopping on three legs, points to an acute injury such as a torn cruciate ligament or meniscus. That is painful from the outset and sits well outside the pattern of a long-standing click in a dog that otherwise moves normally.
A young, rapidly growing large-breed dog producing the sound alongside stiffness after rest or reluctance to jump up benefits from evaluation rather than observation alone, given that developmental joint disease is possible at this age.
Swelling, heat, or a visibly reduced range of motion at the joint producing the sound sits outside the range of harmless joint noise.
A sound that has become more frequent or louder over a period of weeks, rather than staying stable, points towards a progressive rather than static process.
The presence of the click alongside any change in how weight is distributed between the legs when standing still adds useful information beyond the sound itself.
A click that begins to coincide with an occasional skip, hop, or brief non-weight-bearing step, rather than occurring with an otherwise completely normal gait, may warrant characterisation of which joint and grade is involved.
Where the dog is otherwise moving normally, a short video clip of the leg during a walk or on stairs, capturing both the sound and the corresponding movement, gives more information than a description alone and is easy to bring along to a routine check. Noting whether the click happens on every stride or only occasionally, whether it is linked to a particular surface or activity, and whether it is ever accompanied by a skip or brief hop builds a useful pattern over a week or two of observation.
Last reviewed: 9 October 2026 · Dr Alastair Greenway MRCVS