Beagle size by age depends on two AKC size groups. Smaller Beagles stand under 13 inches and weigh under 20 lb. Larger Beagles stand 13 to 15 inches and weigh 20 to 30 lb. Most reach full height by about 8 to 10 months and full weight by about 18 months.
Every puppy grows at its own pace, so a small gap from the chart is normal.
Beagle Size by Age Chart
How much should a Beagle puppy weigh by age?
| Age | 13″ & Under Beagle Weigh | 13–15″ Beagle Weigh |
|---|---|---|
| 1 month | 2–3 lb (0.9–1.4 kg) | 3–4 lb (1.4–1.8 kg) |
| 2 months | 3–5 lb (1.4–2.3 kg) | 4–7 lb (1.8–3.2 kg) |
| 3 months | 7–10 lb (3.2–4.5 kg) | 8–11 lb (3.6–5.0 kg) |
| 4 months | 8–11 lb (3.6–5.0 kg) | 9–12 lb (4.1–5.4 kg) |
| 5 months | 9–12 lb (4.1–5.4 kg) | 10–13 lb (4.5–5.9 kg) |
| 6 months | 12–17 lb (5.4–7.7 kg) | 14–18 lb (6.3–8.2 kg) |
| 7 months | 14–16 lb (6.3–7.3 kg) | 16–20 lb (7.3–9.1 kg) |
| 8 months | 16–20 lb (7.3–9.1 kg) | 18–22 lb (8.2–10 kg) |
| 9 months | 16–20 lb (7.3–9.1 kg) | 20–26 lb (9.1–11.8 kg) |
| 10 months | 16–20 lb (7.3–9.1 kg) | 20–28 lb (9.1–12.7 kg) |
| 12 months | 16–20 lb (7.3–9.1 kg) | 20–30 lb (9.1–13.6 kg) |
| 18–24 months | 16–20 lb (7.3–9.1 kg) | 20–30 lb (9.1–13.6 kg) |
Do male and female Beagles grow differently?
Only a little. Both sexes follow the same AKC height rules. Males are often a few pounds heavier and have a broader chest. Females tend to be lighter and leaner.
A typical adult male weighs about 22 to 26 lb. A typical adult female weighs about 20 to 24 lb. Your puppy’s size group matters more than its sex.
Beagle Height by Age (Inches and cm)
Height is measured from the ground to the withers, the top of the shoulders.
| Age | Typical Height |
|---|---|
| 2 months | 5–8 in (13–20 cm) |
| 4 months | 7–11 in (18–28 cm) |
| 6 months | 9–13 in (23–33 cm) |
| 8–10 months | Near full height |
| 12 months | 11–15 in (28–38 cm) |
| Adult | Up to 13 in or up to 15 in |
Height grows faster than weight in the middle months. That is why a 5-month-old can look long-legged and a bit lanky.
Beagle Puppy Growth Stages Month by Month
Newborn to 8 Weeks Old
A newborn Beagle weighs only about 5 to 12 ounces. The eyes and ears are closed.
By 8 weeks, the pup is weaned, playful, and curious. This is the age most puppies go to new homes.
2 to 6 Months – The Fastest Growth Phase
This is the biggest growth spurt. A Beagle can reach roughly half of its adult weight by 6 months. Baby teeth fall out, and the body begins to stretch out.
6 to 12 Months – The Teenage Phase
Height is nearly done by 8 to 10 months. Weight keeps rising as muscle builds. Expect more energy, more sniffing, and a bit of stubbornness.
12 to 24 Months – Filling Out to Adult Size
A Beagle may look grown at one year. Inside, the body is still finishing. Growth plates, the soft growth zones at the ends of bones, close around 18 months. A Beagle is fully mature at about 2 years.
How Big Will My Beagle Get?
AKC Beagle Size Standards (13″ vs 15″)
The American Kennel Club names two Beagle sizes:
- Under 13 inches: 20 lb or less
- 13 to 15 inches: 20 to 30 lb
The AKC disqualifies a show Beagle taller than 15 inches. Names like “pocket,” “mini,” or “teacup” Beagle are not official. They are just smaller Beagles.
When Do Beagles Stop Growing?
Beagles stop growing in height at about 8 to 10 months. They stop gaining frame and weight at about 18 months. Smaller Beagles often finish a little sooner than larger ones.
Any weight gain after 18 months is extra weight, not growth.
How to Estimate Your Puppy’s Adult Weight
- Check the parents. Genetics is the strongest clue. Big parents usually mean a big puppy.
- Look at the paws. Large paws on a small body suggest more growing ahead.
- Track weekly weigh-ins. Use the same scale at the same time of day.
- Compare to the chart. See which size group your puppy fits.
Feeding a Growing Beagle Puppy
Beagles are food-driven and gain weight easily. Feed measured meals on a schedule instead of leaving food out. Keep treats to about 10% of daily calories.
Growing puppies need puppy food. Don’t switch to a low-calorie diet too early. Ask your vet when to move to adult food, usually near the end of the first year.
Beagle Size by Age FAQs
How big do Beagles get?
Adult Beagles stand up to 15 inches tall. They weigh under 20 lb (13″ group) or 20 to 30 lb (15″ group).
When do Beagles stop growing?
Beagles reach full height at about 8 to 10 months. They finish gaining weight at about 18 months.
How much should a Beagle puppy weigh at 3, 6, and 12 months?
At 3 months, expect 7 to 11 lb. At 6 months, 12 to 18 lb. At 12 months, 16 to 30 lb, depending on size group.
Is my Beagle puppy too small or too skinny?
It’s often fine if your puppy is lively and eats well. Check the ribs and waist, and ask your vet about worms or low weight gain.
Do male and female Beagles grow differently?
Slightly. Males run a few pounds heavier, while females are leaner. Both follow the same height standards.
Final thoughts
Beagle size by age follows a clear path. Most growth happens in the first 6 months. Height tops out around 8 to 10 months, and weight settles near 18 months. Use the Beagle growth chart as a guide, weigh weekly, and check the ribs and waist. Your vet is the best person to ask if something looks off.
John Dale is an animal size researcher and writer focused on measurements, dimensions, and size comparisons. He creates clear, practical content covering height, length, weight, and other key measurements in both U.S. and metric units.
