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 with movement, producing an audible or palpable click with each stride. This medial patellar luxation is graded I to IV by how easily and how often the kneecap moves out of place, and milder grades can be present for months with only an intermittent skip or click before any consistent lameness develops. It is one of the most frequently seen causes of an audible leg click in dogs of these body types.
Benign Soft-Tissue Snap
Not every click reflects joint disease: a tendon or ligament riding over a bony prominence, for example the biceps tendon at the shoulder or a hip flexor near the greater trochanter, can produce a single, repeatable snapping sound with no associated pain, swelling, or change in gait. This kind of mechanical click is more of a physical quirk of that individual's soft-tissue alignment than a sign of joint pathology, and dogs producing it typically move, play, and bear weight completely normally in between.
Hip Dysplasia
In larger and giant breeds such as the German Shepherd, Labrador, and Golden Retriever, a loosely fitting hip joint allows the femoral head to move more than it should within the socket, and this laxity can produce an audible or palpable click or grinding sensation (crepitus), particularly during extension of the hip such as going up stairs. It 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 toward a higher luxation grade or an evolving joint problem, and benefits from characterisation via an orthopaedic assessment rather than continued observation alone.
Patellar luxation and elbow or hip dysplasia are all conditions with recognised staging systems, and clinical significance and future arthritic change tend to track with how far along that staging the joint has progressed, which is why the trajectory of the sound over weeks matters more than any single instance of it.
Conditions commonly associated
Luxating Patella in Dogs
The kneecap tracking out of its groove, most often medially in small breeds, is the single most common structural cause of an audible click in a moving hindlimb.
Hip Dysplasia in Dogs
Laxity in the hip joint of larger breeds produces palpable crepitus or clicking during extension, often before overt lameness is present.
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.
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.
When to explore further
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.
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 the developmental joints involved.
Swelling, heat, or a visibly reduced range of motion at the joint producing the sound sits outside the range of a simple mechanical soft-tissue snap.
A sound that has become more frequent or louder over a period of weeks, rather than staying stable, points toward a progressive rather than static process.
The presence of the click alongside any change in how weight is distributed between the hind legs when standing still adds useful information beyond the sound itself.
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: 13 September 2026 · Dr Alastair Greenway MRCVS