A Great Dane or Bernese puppy can gain more in a month than a small breed weighs as an adult, and his skeleton is building joints at the same speed. That pace is why the joint problems of large and giant breeds are mostly developmental: the shapes are decided while he grows, and the early signs appear long before any arthritis of old age.
Hip and elbow dysplasia
Dysplasia means a joint has formed as a poor fit. In the hip, the ball sits loosely in a shallow socket instead of snugly in a deep one, so the joint moves with slack that grinds the surfaces unevenly. In the elbow, several bones must grow in precise step to make one smooth hinge, and a mismatch leaves ridges and loose fragments that irritate the joint from inside. Owners notice the effects before they have a name for them: a puppy who bunny-hops with both back legs together when he runs, sways through the hips at a walk, struggles to rise after lying down, or is stiff in a front leg after rest and worse after a big day.
Osteochondrosis and panosteitis
Osteochondrosis begins in growing cartilage: an area of joint cartilage that should thin and convert to bone instead thickens and can lift as a flap, showing up most often in the shoulder, elbow, hock, or stifle of a fast-growing youngster. Its signature is a lameness that arrives in adolescence, sometimes after unremarkable exercise, and settles in one joint rather than wandering. Panosteitis is different — an inflammation inside the long bones themselves, common in young large breeds, that classically produces a shifting lameness: the left front leg this week, the right hind a fortnight later, each episode sore to pressure on the bone's shaft. Owners often describe a puppy who is 'lame on a different leg every time,' and that wandering pattern is itself a useful clue to report.
The early signs worth acting on
Single clumsy days mean little at this age, so watch for patterns that repeat. Lameness lasting more than a day or two, or returning in the same leg; stiffness after rest that consistently needs a few minutes to work off; a puppy who curtails his own play, sits out games he used to join, or lags behind on walks he previously finished easily; uneven muscle, where one hindquarter or shoulder is visibly less developed than the other; and reluctance to jump, climb, or be lifted. Pain responses — pulling a leg away, snapping when a joint is handled, yelping at a particular movement — always count. Puppies are growing so fast that 'we will see how he is at his next routine check' can miss the window when diet, exercise adjustment, or referral makes the biggest difference.
Growing him in a way that loads joints kindly
You cannot feed or exercise a genetic tendency away, but you can avoid adding strain to forming joints. Keep a large-breed puppy lean enough to feel ribs easily under a thin fat cover, on a complete diet formulated for large-breed growth, without extra calcium or supplements unless the vet directs them — overfeeding and oversupplementing push growth faster than joints can organise. Let play with adult dogs be supervised so a heavy puppy is not repeatedly bowled over, and remember none of this replaces assessment of a lame puppy.
At the vet, and keeping the growth record
Book promptly for any persistent or recurring lameness, visible unevenness, or pain, and describe the pattern precisely: which leg, after rest or after exercise, how long episodes last, and whether the leg involved changes. That history steers the vet's hands during the examination and the decision about imaging. A growing giant changes so quickly that memory blurs one month into the next, so keeping his weights, growth notes, and each lameness episode and vet finding in his KinsLe Pet Passport gives the practice a dated record of how the problem and the puppy have developed together.