Why large puppies are a special case
A large-breed puppy may look like a small adult dog by six months, but inside, the ends of the long bones are still soft growth plates and the joints are still shaping themselves to fit together. That unfinished structure tolerates ordinary play well but handles repeated pounding badly, and the damage from overloading it tends not to show until the dog is older, as stiffness and sore joints that limit the active life you wanted for them. Rapid growth adds to the strain: every extra pound a big puppy carries is multiplied through hips, elbows, and shoulders with every stride, jump, and clumsy landing on a hard floor.
Feed for steady growth, not maximum growth
The instinct to feed a big puppy generously so they reach their full size is exactly backwards. Large puppies do best growing slowly and lean — ribs easy to feel under a light covering, a visible waist from above — on a food formulated for large-breed growth, measured out rather than poured freely. Follow the guide amounts as a starting point, weigh your puppy regularly, and adjust with your vet's input rather than adding extras because the puppy still looks hungry; big puppies nearly always look hungry. Keep treats counted within the day's food rather than on top of it, and be wary of well-meaning visitors topping up the bowl.
Match exercise to unfinished joints
Short, frequent, and controlled beats long and heroic. Several modest lead walks a day on grass or other forgiving ground, plus free play where the puppy can speed up, slow down, and stop at will, build muscle that supports the joints without battering them. What to ration hard in the first year and beyond: running beside a bike, repeated throws that end in skidding stops, games built around leaping to catch, long hikes over rough ground, and daily flights of stairs charged at speed. Carry the puppy on stairs while they are small enough, supervise any jumping down from sofas or car boots, and lift rather than letting a heavy puppy launch themselves out of the car.
Make the house kinder to growing legs
Slippery floors are an underrated joint hazard for a gangly puppy whose legs splay out during every excited turn. Runners and mats on the main routes through the house, especially near doors and food bowls, give growing hips and elbows the grip they need. Keep play fights with bigger dogs supervised and short, because a much heavier playmate body-slamming a young puppy loads those joints in ways the puppy cannot control. Provide chews and sniffing games as low-impact ways to tire the brain on days when you deliberately keep physical exercise light — a tired mind still leads to a settled evening.
Use vet checks to steer, not just to weigh
Regular growth checks are where joint protection becomes a plan instead of a hope: your vet can judge whether the growth curve is steady, whether body condition is drifting, and whether a gait oddity is a passing puppy clumsiness or something worth examining. Mention any bunny-hopping, reluctance to rise, lagging on walks, or yelping during play rather than waiting for it to pass, because early changes are the ones that respond best to adjusted exercise and weight. Keeping those weights, check notes, and feeding adjustments recorded in KinsLe's Pet Passport means the full growth picture travels with your puppy to every appointment, instead of relying on memory between visits.