Medium breed

Border Collie Weight Chart & Growth Guide

Updated weekly

Border Collies are built for work: quick movement, sharp turns, problem solving, and sustained focus. This guide treats the chart as only one piece of the picture, alongside workload, muscle, body condition, recovery, and the mental stimulation that keeps routine stable.

For Border Collies, the question is not only weight. It is whether the dog has enough fuel, muscle, recovery, and work.

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Border Collie puppy for the Border Collie weight chart and growth guide

Overview

Life Span

Adult range

14-20 kg

30.9-44.1 lb

Size class

Medium breed

Matched size chart

Growth pace

Moderate

Typical for this breed size

Check-in cadence

Weekly to monthly

Suggested rhythm

<16 w weekly | 16-32 w biweekly | 32 w+ monthly

Weight by age

Border Collie Weight Chart by Age

Border Collies are medium herding dogs with a lean, agile build. Many adults fall around 30-45 lb in this guide, while broader breed references may include larger individuals.

The healthiest Border Collie is not the heaviest one. Use this chart with workload, body condition, muscle, and recovery.

AgeTypical RangeWorking-Dog Note
2 months6-10 lb (2.7-4.5 kg)Fast early growth
3 months10-16 lb (4.5-7.3 kg)Coordination developing
4 months14-22 lb (6.4-10 kg)Lean frame expected
5 months18-28 lb (8.2-12.7 kg)Activity level matters
6 months22-32 lb (10-14.5 kg)Muscle starting to show
8 months26-38 lb (11.8-17.2 kg)Teen workload rising
10 months30-42 lb (13.6-19.1 kg)Adult outline forming
12 months30-45 lb (13.6-20.4 kg)Near adult range for many
18 months30-45 lb (13.6-20.4 kg)Condition follows workload

Maturity

When Does a Border Collie Stop Growing?

Border Collies often reach most height near the first year, but muscle, conditioning, stamina, and work habits continue maturing afterward.

6-9 months

Adolescent frame

The puppy may look lean and leggy while coordination and focus are still developing.

9-12 months

Adult outline appears

Height and outline are closer to adult size, but muscle and stamina are not finished.

12-18 months

Conditioning stage

Training, rest, and workload shape muscle more than simple growth.

18+ months

Working maturity

Adult Border Collies maintain condition through balanced work, recovery, and measured fuel.

Key takeaway

Lean is normal; weak is not.

A Border Collie should look athletic and defined, but poor stamina, sharp bones, or fading energy need attention.

Growth check

Signs Your Border Collie Is Growing Well

A healthy Border Collie trend shows lean weight, good muscle, steady appetite, comfortable movement, and normal recovery after work.

Positive signs

  • Ribs are easy to feel but not sharply exposed.
  • Waist and tuck are visible on the athletic frame.
  • Puppy recovers normally after age-appropriate activity.
  • Stool stays steady as workload and food change.
  • Focus, curiosity, and trainability stay bright.
  • Muscle develops over shoulders, back, and thighs without extra padding.

Worth monitoring

  • Weight drops while appetite and workload stay high.
  • Ribs, spine, or hip points become sharp.
  • Dog tires quickly, seems sore, or takes too long to recover.
  • Weight rises after training or exercise drops.
  • Destructive behavior increases because mental work is missing.

Workload note

The same food amount may not fit every week.

Border Collie calorie needs can change with training volume, rest days, weather, and growth stage.

Weight factors

What Affects a Border Collie's Weight?

Border Collie weight is shaped by genetics, line type, workload, mental enrichment, recovery, and muscle.

Line type

Working and companion lines

Some Border Collies stay compact and extremely lean, while others mature with a slightly broader companion-dog frame.

Workload

Activity changes calories

A week of agility, herding, hiking, or flyball can require different fuel than a quiet week.

Mind

Mental work affects routine

Boredom can disrupt sleep, appetite, chewing habits, and consistency at home.

Muscle

Athletic condition

A fit Border Collie may look light on the scale but have strong shoulder, back, and thigh muscle.

Health

Movement and recovery

Soreness, paw wear, joint discomfort, or poor recovery should be logged with weight checks.

Breed snapshot

Why this breed needs context

Border Collie puppy body condition snapshot for growth tracking
Balanced medium pace<16 w weekly | 16-32 w biweekly | 32 w+ monthly

Temperament profile

Driven • Athletic • Intelligent

Border Collie dogs are usually driven and athletic, and steady routines make their growth trend easier to read over time.

Daily rhythm

High energy, Medium grooming

Daily structured activity and enrichment help keep growth trends steady.

Weight-tracking note

Best read through repeat check-ins

Low-activity weeks can change weight and behavior quickly

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Calculator

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Open the homepage calculator with Border Collie selected and compare the live result with this guide.

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Size chart

Open the matching size chart

Use the Medium size chart to compare the broader checkpoint range behind this breed guide.

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Guide

Read healthy weight basics

Review the core framework for trend tracking, body condition, and using ranges responsibly.

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Related guides

Read this Border Collie chart with supporting context

Age guide

Puppy weight chart by age

Compare Border Collie checkpoints with month-by-month puppy growth context before reading the breed graph.

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Condition

Body condition score guide

Use rib, waist, and tuck checks to decide whether Border Collie's number looks healthy in real life.

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Maturity

When dogs stop growing

Compare Medium growth timing with the point when height, muscle, and fill-out usually slow.

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Healthy range

Healthy dog weight basics

Use trend tracking and routine notes to keep Border Collie's estimate grounded.

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Growth

Border Collie Growth and Weight Chart

Growth graph

Border Collie male & female growth chart

Male and female Border Collie dogs grow at different rates through the first year.

Breed-specific monthly chart

Chart span

1-12 months

Breed-specific monthly view

Male at 12 months

21.6 kg

47.5 lb

Female at 12 months

18 kg

39.7 lb

Re-check cadence

2-3 weeks

Trend beats one weigh-in

Monthly reference 1-12 months
Border Collie male & female growth chart Breed-specific growth chart for Border Collie from 1 through 12 months in kg.0510152025123456789101112 Male Female Age (months) Weight (kg)
Male line Female line

This breed-specific chart tracks the average monthly line for male and female Border Collie puppies from 1-12 months. Steady progress matters more than one weigh-in.

Calculator bridge

Want a live estimate from your dog's current age and weight?

Open the homepage calculator with Border Collie selected, add the latest weigh-in, then compare the result back against this guide.

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What this means

How to read this graph for Border Collie

  • Use the male line for male puppies and the female line for female puppies, because Border Collie dogs often grow at different rates through the first year.
  • Month-to-month progress matters more than one high or low weigh-in, especially during the faster early-growth months.
  • Use the live calculator after repeat weigh-ins, then compare the result back to this breed-specific chart to confirm the trend is still moving steadily.

When to re-check

<16 w weekly | 16-32 w biweekly | 32 w+ monthly

Re-check a Border Collie every 2 weeks during active growth, and sooner when activity, training load, or appetite changes sharply.

Next action

Run the live estimate with this breed selected

Most useful after a fresh weigh-in, then compare the result back against this breed graph and the matching size chart.

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Stages

Border Collie Growth Stages Explained

Border Collie growth combines body development with mental maturity. The brain needs a job as much as the body needs exercise.

Birth - 8 weeks

Early herding-dog foundation

Puppies depend on breeder care, early handling, and social exposure before training begins at home.

2 - 4 months

Learning routine

Meals, naps, handling, recall, and socialization shape confidence before high-intensity work is appropriate.

4 - 7 months

Fast learner stage

Energy and focus grow quickly. Use short training, walks, sniffing, and calm settle practice.

7 - 12 months

Teen athlete

The dog may want more work than the body is ready for. Build skills and recovery without overdoing impact.

12 - 18 months

Conditioning and maturity

Muscle, stamina, and reliable focus improve with structured training and appropriate rest.

18+ months

Balanced working adult

Adult maintenance combines fuel, training, mental work, rest days, paw checks, and body-condition tracking.

Feeding rules

Feeding Rules Every Border Collie Owner Should Know

Rule 1

Match food to workload

Adjust slowly when training, hiking, sport, or rest days change, and confirm with body condition.

Rule 2

Use scheduled meals

Puppies often need regular meals, while adults usually do well with two measured meals.

Rule 3

Use life-stage food

Puppy food is commonly used until about 12-18 months, then adult food can match activity level.

Rule 4

Feed after calm recovery

Let the dog cool down and settle after intense work before feeding a full meal.

Rule 5

Hydrate around work

Keep water available during active days and monitor recovery in warm weather.

Rule 6

Use food puzzles wisely

Puzzle feeders can add mental work, but they should hold measured food, not extra calories.

Feeding

How Much Should I Feed My Border Collie?

Border Collie portions depend on age, adult frame, activity load, food calories, body condition, and recovery.

Workload matched - lean condition - recovery aware

Puppy rhythm

Regular meals support busy puppies

Young Border Collies often need predictable meals. Track stool, appetite, and energy as training increases.

Activity rule

Do not use one portion forever

A heavy training month and a quiet weather week may need different calorie decisions.

Lean check

Ribs easy, bones not sharp

The target is an athletic dog with muscle and stamina, not a ribby dog or a padded one.

Daily life

Temperament & daily fit

Border Collie puppy daily life photo for healthy weight guidance
DrivenAthleticIntelligent

Good fit for

Homes that match this breed

  • Very active owners who enjoy training, sports, hiking, or structured work
  • Homes that can provide daily mental stimulation, not just walks
  • People who can read a lean dog without overfeeding for bulk

Things to watch

What can change the trend

  • Low-activity weeks can change weight and behavior quickly
  • A naturally lean frame can make underfeeding or overwork harder to spot
  • Boredom may create destructive behavior that disrupts feeding and exercise routines

Care

Care routine

Feeding

Match calories to real daily workload and keep the dog lean but not ribby.

Exercise

Daily movement, training, games, and mental work are essential for this breed.

Grooming

Brush the double coat regularly and check ears, paws, and nails after outdoor work.

Training

Border Collies need clear jobs, thoughtful reinforcement, and calm recovery as much as physical outlets.

Warning signs

Warning Signs: Is Your Border Collie Overweight or Underweight?

Border Collies can be naturally lean, so read weight together with muscle, energy, and recovery.

Signs of extra weight

  • Ribs become hard to feel under the coat
  • Waist and tuck soften noticeably
  • Speed, turning, or jumping feels heavier
  • Dog tires sooner during normal work
  • Weight rises after activity drops
  • Restlessness increases but exercise quality is inconsistent

Signs of too little weight

  • Ribs, spine, or hip points are sharply visible
  • Muscle over shoulders or thighs looks thin
  • Energy fades before normal work is done
  • Recovery takes longer than usual
  • Appetite is high but weight keeps dropping
  • Stool changes, stress, or overwork coincides with weight loss

Similar breeds

Compare similar guides

Next step

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FAQ

Frequently asked questions

Many Border Collies fall around 30-45 lb (14-20 kg) in this guide, though some breed references include individuals up to about 55 lb. Body condition and workload matter.

Many 6-month Border Collies are around 22-32 lb (10-14.5 kg), but workload, frame, and line type can shift the healthy range.

Many reach most height by around 12 months, then continue developing muscle, stamina, and working maturity through 18 months or more.

Yes, many Border Collies are naturally lean and athletic. Ribs should be easy to feel, but spine and hip points should not look sharp.

Most need significant daily physical exercise plus mental work. Training, puzzles, sniffing, sport, or herding-style tasks matter as much as distance walked.

Track workload, rest days, stamina, recovery, muscle, rib feel, waist, appetite, stool, paws, nails, and behavior changes.

Call your vet if weight drops despite eating, weight rises quickly after activity changes, lameness appears, recovery worsens, appetite changes, or energy falls unexpectedly.

Estimates only. Not veterinary advice.