How Fast Do Labrador Retrievers Grow?
Labrador Retrievers grow fast during their first year, with most reaching about 70% of their adult weight by six months old.
Even though they look big fast, they do not fully finish growing until they are around 18–24 months old. During this time, their bones, joints, and muscles are still developing.
That’s why Labs often seem to go from tiny puppies to full-sized dogs almost overnight. But growing isn’t just about getting bigger, it also affects their health, behavior, and the way you need to take care of them.
Growth Timeline
Birth to 8 Weeks
1. Tiny and fragile at birth, weighing less than a pound.
2. Rapid weight gain, doubling in size within the first week.
3. By 8 weeks, most weigh between 10 and 15 pounds.
2 to 6 Months (The Fast Growth Stage)
1. This is the biggest growth spurt.
2. By 3 months: 20–30 pounds.
3. By 6 months: 50–60 pounds, which is about two-thirds of adult size.
4. Legs appear long, paws oversized, and the body sometimes looks out of proportion; this is normal.
6 to 12 Months (Slowing Down)
1. Growth slows, but steady muscle and bone development continues.
2. Weight ranges from 55–70 pounds by 12 months.
3. Height is close to adult size, but the body still “fills out.”
12 to 24 Months (Maturing Stage)
1. Growth plates close around 18 months.
2. Final adult weight: 65–80 pounds for females, 75–90 pounds for males.
3. Chest broadens, muscles thicken, and puppy awkwardness fades.
When Do Labradors Stop Growing?
Most Labs stop height growth by 12 months, but they continue to gain weight and muscle until about 18–24 months. So, while they may look “adult” at a year old, they are still developing inside.
This late maturing is why vets recommend avoiding strenuous activities like running on hard surfaces or jumping from heights during the first 18 months; joints and bones need time to fully set.
Factors That Affect Labrador Growth
Not all Labs grow at the same speed. Several factors play a role:
- Genetics: Lineage affects final size, English Labs (stockier) vs. American Labs (leaner).
- Nutrition: Overfeeding can lead to unhealthy weight gain, while underfeeding may slow development.
- Exercise: Exercising too much, too soon, can damage joints; exercising too little can lead to obesity.
- Health conditions: Issues like parasites or joint problems can impact growth.
Healthy Labrador Weight by Age (Average Guide)
| Age | Weight (Male) | Weight (Female) |
|---|---|---|
| 3 Months | 22–30 lbs | 20–25 lbs |
| 6 Months | 50–60 lbs | 45–55 lbs |
| 9 Months | 60–70 lbs | 52–65 lbs |
| 12 Months | 70–80 lbs | 60–72 lbs |
| Adult | 75–90 lbs | 65–80 lbs |
Frequently Asked Question(s)
Why does my Lab look skinny?
Fast-growing Labs often appear lanky with ribs showing between 4–8 months. This is normal if energy levels and appetite are good.
Why is my Lab gaining too much weight?
They are prone to obesity. Rapid weight gain stresses developing joints and can shorten lifespan. Stick to measured meals, avoid free-feeding, and use healthy treats in moderation.
Do male and female Labs grow at different speeds?
Yes. Males typically grow larger and may continue filling out longer, while females mature a little faster and remain slightly smaller.