Joint health & puppy growth
Young joints are held together by cartilage growth plates that have not yet turned to bone. Over-exercising during that window is one of the few genuinely irreversible mistakes an owner can make — and it looks like an enthusiastic puppy having a wonderful time.
The five-minute rule
The widely used guideline is five minutes of structured exercise per month of age, up to twice a day. Structured means lead walks, jogging, fetch and stair work. Free play in a garden, where the puppy sets its own pace and stops when tired, does not count against the budget.
| Age | Per outing | Per day |
|---|---|---|
| 3 months | 15 minutes | up to 30 minutes |
| 4 months | 20 minutes | up to 40 minutes |
| 6 months | 30 minutes | up to 60 minutes |
| 9 months | 45 minutes | up to 90 minutes |
| 12 months | 60 minutes | up to 120 minutes |
When growth plates close
| Adult size | Plates typically closed | Hold off on |
|---|---|---|
| Toy (under 5 kg) | 8–11 months | repeated jumps off furniture |
| Small (5–10 kg) | 10–12 months | long road running |
| Medium (10–25 kg) | 12–14 months | agility jumps, sustained jogging |
| Large (25–40 kg) | 14–18 months | road running, stair repeats, jump training |
| Giant (40 kg+) | 18–24 months | all forced repetitive exercise on hard ground |
Large-breed puppies carry the highest risk
Surfaces and movement quality
- • Grass, forest trails and sand absorb impact; tarmac and concrete return it into the joint.
- • Put a runner or rug on slippery floors — repeated splaying strains hips and shoulders.
- • Lift small or long-backed dogs in and out of the car rather than letting them jump down.
- • Straight-line trotting beats sharp turns and hard stops; ball launchers are unusually hard on joints.
Adults and seniors
Older joints do better with frequency than intensity: two or three short walks beat one long one, and a five-minute flat warm-up before any pace change makes a measurable difference. Watch for stiffness on rising, lagging on the return leg, reluctance at stairs, or a changed sitting posture — these are early arthritis signs and reasons to shorten sessions and speak to your vet, not to push through. Keeping weight down remains the single most effective joint intervention available to an owner.