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Estimates only. Not veterinary advice.
Updated weekly
Collies should grow into elegant, capable herding companions rather than bulky dogs. This guide pairs the weight chart with coat type, moderate daily exercise, sensitive training, Collie eye anomaly context, MDR1 medication awareness, skin and coat care, and meal timing for a deep-bodied large breed.
A Collie should feel athletic under the coat, with enough condition for work and enough leanness for clean movement.
Overview
Adult range
23-34 kg
50.7-75 lb
Size class
Large breed
Matched size chart
Growth pace
Slower
Typical for this breed size
Check-in cadence
Weekly to monthly
Suggested rhythm
<16 w weekly | 16-32 w biweekly | 32 w+ monthly
Quick answers
Use these answers when you need the practical version first. A healthy Collie should look lithe, strong, balanced, and graceful, with no extra bulk hiding under the rough coat or being mistaken for substance in a smooth coat.
Adult range
The official Collie standard lists males at 24-26 inches and 60-75 lb, and females at 22-24 inches and 50-65 lb. The right target still depends on sex, height, coat, ribs, waist, muscle, movement, and veterinary body-condition scoring.
6 months
Many 6-month Collies fall around 37-58 lb, with males often higher and females often lower. Judge the trend through steady growth, rib feel, waist, stool, energy, and movement rather than one isolated weigh-in.
Full grown
Collies often look close to adult height around the first year, then continue building coat, muscle, stamina, and mature condition into about 18-24 months.
Coat check
A rough Collie's full coat can hide a softening waist or padded ribs. A smooth Collie shows changes sooner, but both varieties need hands-on checks during grooming.
Health record
A useful Collie log includes meals, treats, ribs, waist, coat, exercise, eye exams, vision confidence, MDR1 status, medication reactions, skin lesions, stool, retching, belly swelling, and recovery.
Weight by age
Collies are large herding dogs. Many males fall around 60-75 lb, while many females fall around 50-65 lb.
Use this chart with coat-aware body checks. A Collie should look graceful, not padded, and should move easily.
| Age | Male Weight | Female Weight |
|---|---|---|
| 2 months | 10-16 lb (4.5-7.3 kg) | 8-14 lb (3.6-6.4 kg) |
| 3 months | 18-28 lb (8.2-12.7 kg) | 15-25 lb (6.8-11.3 kg) |
| 4 months | 28-40 lb (12.7-18.1 kg) | 23-35 lb (10.4-15.9 kg) |
| 5 months | 37-50 lb (16.8-22.7 kg) | 31-44 lb (14.1-20 kg) |
| 6 months | 44-58 lb (20-26.3 kg) | 37-52 lb (16.8-23.6 kg) |
| 8 months | 52-68 lb (23.6-30.8 kg) | 43-60 lb (19.5-27.2 kg) |
| 10 months | 58-73 lb (26.3-33.1 kg) | 48-64 lb (21.8-29 kg) |
| 12 months | 60-75 lb (27.2-34 kg) | 50-65 lb (22.7-29.5 kg) |
| 18 months | 60-75 lb (27.2-34 kg) | 50-65 lb (22.7-29.5 kg) |
Maturity
Collies often reach much of their height around the first year, then continue filling into adult muscle, coat, and stamina.
Legs, body length, and coordination change quickly.
Exercise needs rise, but growth should remain controlled.
Height and silhouette look mature while muscle and coat continue developing.
Adult routine shapes stamina, coat, and lean condition.
Key takeaway
The best Collie trend protects movement, coat health, and long-term comfort rather than pushing size.
Growth check
A healthy Collie puppy should be alert, responsive, comfortable moving, and lean under the coat.
Collie note
Eye history and MDR1 status are useful context to keep alongside normal growth notes.
Weight factors
Collie weight is shaped by sex, coat type, herding activity, food portions, eye health, medication sensitivity, digestion, and large-breed growth pace.
Adult males commonly carry more size, while females often stay lighter.
Rough coats can hide condition, while smooth coats reveal changes sooner.
Daily movement and training help preserve muscle without overfeeding.
Vision changes can affect confidence and activity.
Ask your vet about MDR1 testing and note medication reactions.
Use calm feeding routines and watch for urgent bloat signs.
Breed snapshot
Temperament profile
Collie dogs are usually gentle and responsive, and their larger frame is easiest to read when meals, activity, and weigh-ins stay steady.
Daily rhythm
Use calm consistency, measured activity, and coat-aware body-condition checks.
Weight-tracking note
Full rough coat can hide rib and waist changes
Use this page with
Calculator
Open the homepage calculator with Collie selected and compare the live result with this guide.
Open calculatorSize chart
Use the Large size chart to compare the broader checkpoint range behind this breed guide.
Open size chartGuide
Review the core framework for trend tracking, body condition, and using ranges responsibly.
Open guideRelated guides
Age guide
Compare Collie checkpoints with month-by-month puppy growth context before reading the breed graph.
Open age guideCondition
Use rib, waist, and tuck checks to decide whether Collie's number looks healthy in real life.
Open condition guideLarge growth
Use slow-growth context for Collie's frame, food routine, and exercise plan.
Open large guideMaturity
Compare Large growth timing with the point when height, muscle, and fill-out usually slow.
Open timing guideGrowth
Growth graph
Use this large herding-dog reference to compare Collie growth from 1 to 12 months.
Chart span
1-12 months
Breed-specific monthly view
Male at 12 months
33 kg
72.8 lb
Female at 12 months
28.8 kg
63.5 lb
Re-check cadence
2-4 weeks
Trend beats one weigh-in
This breed-specific chart tracks the average monthly line for male and female Collie puppies from 1-12 months. Steady progress matters more than one weigh-in.
Calculator bridge
Open the homepage calculator with Collie selected, add the latest weigh-in, then compare the result back against this guide.
What this means
When to re-check
Re-check a Collie every 2 to 4 weeks during growth, and sooner if exercise, food, coat condition, eye signs, or medication changes.
Next action
Most useful after a fresh weigh-in, then compare the result back against this breed graph and the matching size chart.
Stages
Collie growth combines large-breed structure, responsive training, coat care, eye awareness, and steady herding-dog activity.
Birth - 8 weeks
Early growth, eye history, feeding, and handling records help shape expectations.
2 - 5 months
Build meals, brushing, leash skills, and gentle confidence.
5 - 10 months
Energy rises, coat changes, and training needs consistency without overwork.
10 - 15 months
Height nears adult size while muscle, coat, and stamina keep developing.
15 - 24 months
Adult movement and coat settle with measured food and regular work.
24+ months
Adult care centers on coat, eyes, medication records, meals, and lean stamina.
Feeding rules
Avoid pushing fast or heavy gains.
Measured meals help compare appetite, stool, and weight.
Avoid hard exercise right around full meals.
Puppy, adult, and senior formulas serve different needs.
Water supports exercise, coat, and digestion.
Track stool, coat, skin, appetite, and weight during transitions.
Feeding
Collie portions depend on age, sex, coat type, food calories, activity, body condition, digestion, and growth stage.
Puppy meals
Feed enough for energy and frame without making the puppy heavy.
Coat rule
Brush time should include ribs, waist, skin, and stool notes.
Meal timing
Calm meal timing helps a deep-bodied breed stay comfortable.
Daily life
Good fit for
Things to watch
Care
Use measured meals that support lean large-breed growth, with calm timing around exercise.
Provide daily walks, herding-style games, training, and play without overloading growing joints.
Brush according to coat type and use grooming time to check ribs, skin, feet, and coat mats.
Use gentle, positive, consistent training because Collies are responsive and sensitive.
Warning signs
Collie coat can hide condition, so use hands-on checks and movement quality.
Similar breeds
Next step
Use live age and weight inputs, then compare the result with this breed guide and its matching size chart.
FAQ
This page combines official Collie size and structure guidance, parent-club health priorities, Collie Health Foundation education, veterinary genetics references, large-breed nutrition guidance, GDV emergency context, and body-condition resources. It is a tracking guide for better vet conversations, not a diagnosis.
Estimates only. Not veterinary advice.