Boston Terrier Weight & Growth Chart

Complete weight guide with growth charts for male and female Boston Terriers from puppy to adult.

Male Adult Weight

12–25 lbs

Female Adult Weight

10–22 lbs

Boston Terrier Weight Overview

A fully grown Boston Terrier weighs between 12 and 25 pounds. Males range 12–25 lbs; females 10–22 lbs.

Three weight classes exist: under 15 pounds, 15 to 20 pounds, and 20 to 25 pounds. The breed should be compact and muscular without appearing bulky..

Growth Chart

When Does a Boston Terrier Stop Growing?

Expect your Boston Terrier to reach adult height of 15–17 inches by 12–15 months. Full body maturity—including muscle development toward the 12–25 lb target—may continue until 14–18 months.

Growth is influenced by genetics, nutrition quality, and spay/neuter timing. Brachycephalic concerns are present but generally milder than other flat-faced breeds. Eye problems and patellar luxation are the most common veterinary visits..

Is My Boston Terrier Overweight?

Assessing your Boston Terrier's body condition (healthy range: 12–25 lbs):

Rib check: Run your hands along the ribcage—you should feel individual ribs under a slight fat layer
Overhead view: A defined waist should be visible between ribs and hips
Side profile: The abdomen should tuck upward behind the last rib

Overweight Boston Terriers face higher risks of Brachycephalic Obstructive Airway Syndrome, joint problems, and shortened lifespan. Even for a small-sized breed, excess weight significantly impacts joint health and overall wellbeing. Work with your vet to adjust feeding and exercise if needed.

Feeding Recommendation

Plan on 0.5–0.5 cups of premium dry food daily for your adult Boston Terrier, divided into morning and evening meals. Given this non-sporting breed's predisposition to Brachycephalic Obstructive Airway Syndrome, discuss dietary approaches that may help manage this risk with your vet. Three weight classes exist: under 15 pounds, 15 to 20 pounds, and 20 to 25 pounds. The breed should be compact and muscular without appearing bulky..

Weight by Age Table

Age	Male (lbs)	Female (lbs)
3 months	5.6–6.9	4.7–5.9
6 months	12.2–15.3	10.4–13.0
9 months	17.8–22.2	15.1–18.9
12 months	22.2–27.8	18.9–23.6

Frequently Asked Questions

Males: 12–25 lbs. Females: 10–22 lbs. Three weight classes exist: under 15 pounds, 15 to 20 pounds, and 20 to 25 pounds. The breed should be compact and muscular without appearing bulky.. Consult your vet for a personalized assessment.

The Boston Terrier reaches full adult size (15–17 inches, 12–25 lbs) by approximately 12–15 months. Moderate daily exercise of 30 to 45 minutes through walks and play sessions. Enjoy interactive games like fetch but should avoid overexertion in hot weather.. Growth rate is influenced by genetics, diet, and overall care.

For a Boston Terrier at healthy weight (12–25 lbs), you should feel ribs without pressing hard, see a defined waist from above, and notice an abdominal tuck from the side. Even modest excess weight stresses this small-sized breed's frame and can worsen conditions like Brachycephalic Obstructive Airway Syndrome.

Feeding amounts depend on age, current weight, and the Boston Terrier's expected adult size of 12–25 lbs. Puppies under 6 months need 3–4 meals daily; older puppies eat twice daily. A high-quality puppy food formulated for small breeds provides the right nutrient balance. Brachycephalic concerns are present but generally milder than other flat-faced breeds. Eye problems and patellar luxation are the most common veterinary visits..

Poor weight gain in a Boston Terrier puppy warrants a vet visit. For a breed that should reach 12–25 lbs at maturity, slow growth can signal parasites (very common in puppies), underfeeding, food intolerance, or illness. Regular weigh-ins help track progress objectively. Your vet will likely run a fecal test and blood work.