Border Collie Weight & Growth Chart

Complete weight guide with growth charts for male and female Border Collies from puppy to adult.

Male Adult Weight

30–55 lbs

Female Adult Weight

25–48 lbs

Border Collie Weight Overview

Males weigh 30 to 45 pounds, females 27 to 42 pounds. They should be lean and athletic, built for endurance rather than power. Any excess weight reduces their working ability.. Males tend to be larger at 30–55 lbs versus 25–48 lbs for females.

Genetics, diet, and exercise all play a role in determining your dog's ideal weight. The growth chart below provides a general timeline for weight gain from puppyhood through adulthood.

Growth Chart

When Does a Border Collie Stop Growing?

Most Border Collies reach adult height of 18–22 inches by 12–15 months, with full body weight of 30–55 lbs achieved shortly after. Males fill out to 55 lbs while females reach 48 lbs.

Growth rate is influenced by genetics, diet quality, and spay/neuter timing. Needs a minimum of two hours of intense daily exercise, plus mental work. Herding, agility, flyball, and disc dog competitions are ideal. Simple walks are not sufficient for this breed..

Is My Border Collie Overweight?

Assessing your Border Collie's body condition (healthy range: 30–55 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 Border Collies face higher risks of Hip Dysplasia, joint problems, and shortened lifespan. Even for a medium-sized breed, excess weight significantly impacts joint health and overall wellbeing. Work with your vet to adjust feeding and exercise if needed.

Feeding Recommendation

Daily food for an adult Border Collie: 0.5–1.1 cups of high-quality dry food in two meals, budgeting $57–88/month. Puppies growing toward 30–55 lbs need three to four daily feedings until around six months old. Generally healthy for their size, but Collie Eye Anomaly and hip dysplasia should be screened. Trapped Neutrophil Syndrome is rare but fatal, and DNA testing is available.—treats count toward daily calorie intake.

Weight by Age Table

Age	Male (lbs)	Female (lbs)
3 months	12.3–15.2	10.4–12.9
6 months	27.1–33.4	23.0–28.5
9 months	39.4–48.6	33.4–41.4
12 months	49.2–60.8	41.8–51.7

Frequently Asked Questions

Males: 30–55 lbs. Females: 25–48 lbs. Males weigh 30 to 45 pounds, females 27 to 42 pounds. They should be lean and athletic, built for endurance rather than power. Any excess weight reduces their working ability.. Consult your vet for a personalized assessment.

Most Border Collies reach adult height of 18–22 inches by 12–15 months, with full body weight of 30–55 lbs achieved shortly after. Males weigh 30 to 45 pounds, females 27 to 42 pounds. They should be lean and athletic, built for endurance rather than power. Any excess weight reduces their working ability..

For a Border Collie at healthy weight (30–55 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 medium-sized breed's frame and can worsen conditions like Hip Dysplasia.

Feeding amounts depend on age, current weight, and the Border Collie's expected adult size of 30–55 lbs. Puppies under 6 months need 3–4 meals daily; older puppies eat twice daily. A high-quality puppy food formulated for medium breeds provides the right nutrient balance. Generally healthy for their size, but Collie Eye Anomaly and hip dysplasia should be screened. Trapped Neutrophil Syndrome is rare but fatal, and DNA testing is available..

Poor weight gain in a Border Collie puppy warrants a vet visit. For a breed that should reach 30–55 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.