Personalized Chart
Enter age and weight to see your dog's unique trajectory.
Puppy Predictor
Collie Size Calculator
How big will my Collie get? Predict adult weight and track your puppy's development.
Start with these for your Collie
We picked these products to help you take better care of your dog day to day, from a more comfortable place to sleep to safer walks, easier feeding, and the right setup at home. Each category is narrowed to options that are highly rated and make sense for your dog's size and stage.
Roomy crates
Top Rated
Amazon Basics Folding Metal Crate with Growth Divider
★ 4.7
(11.0k)$52.74
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Comfy beds
Top Rated
EHEYCIGA Orthopedic Washable Memory Foam Bed
★ 4.5
(19.6k)$39.98
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Walk-ready harnesses
Top Rated
BARKBAY No-Pull Comfort Walking Harness
★ 4.5
(13.4k)$27.99
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Slow feeders
Keegud Raised Slow Feeder for Better Digestion
★ 4.3
(6.6k)$7.64
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After your estimate
First-year playbook for Collie puppy parents
Collie puppies are gentle herders with a dramatic coat and sound sensitive souls. Your estimate pairs with grooming honesty, careful socialization, and mental exercise.
Your projection
Coat hides weight; palpate.
Lines vary in size; compare parents.
Monthly trend matters.
- Weigh every 2 to 3 weeks.
- Photos monthly.
- Log treats.
- Ask vet condition demo.
Growth and sensitivity
Fear periods normal; pain plus fear vet.
Some lines carry MDR1 drug sensitivity; breeder/vet discussion.
Limping after play: vet.
- Socialize easy distances.
- Sound low volume first.
- Measure meals.
- Avoid obesity.
What changes month to month
Puppyhood is not one stage. It is a stack of different problems and wins. Use this like a timeline, not a rigid rulebook.
- Phase 18 to 12 weeks: soft start
Routine, potty, handling.
- Crate schedule.
- Potty after sleep play meals.
- Marker training.
- Brush intro micro sessions.
- No flooding socialization.
- Phase 23 to 6 months: skills
Impulse before adolescence.
- Loose leash.
- Wait doors; place.
- Polite dog intros.
- Novel environments rewards.
- Limit jump overload young.
- Phase 36 to 14 months: teenage collie
Noise and nipping.
- Mental daily.
- Long line recall.
- If sound panic, lower intensity.
- Watch weight.
- Guest calm routine.
- Phase 414 to 24 months: young adult
Polish and coat care.
- Exercise per vet.
- Grooming routine.
- Training continues.
- Social experiences ongoing.
Start with these for your Collie
We picked these products to help you take better care of your dog day to day, from a more comfortable place to sleep to safer walks, easier feeding, and the right setup at home. Each category is narrowed to options that are highly rated and make sense for your dog's size and stage.
Daily care
Feeding, exercise, training, home setup, and prevention. Each block is written for people who just checked their puppy’s weight curve.
Feeding
Quality growth diet per vet.
Measured meals.
Slow transitions.
- Treat budget.
- Drugs/supplements: vet knows MDR1 if applicable.
- Fresh water.
Exercise
Walks and play.
Heat: heavy coat.
End before overtired.
- Stop if limping.
- Cooler walks summer.
- Alternate intensity.
Training
Teach off switch mat crate.
Gentle socialization.
Avoid harsh corrections.
- Separation practice.
- Qualified help fear issues.
- Door manners.
Home
Brush schedule realistic.
Window film if visual barking.
- Toy rotation.
- Secure yard.
- White noise apartments.
Prevention
Vaccines parasites per vet.
Breeder screening discussion.
Dental tolerance.
- Weight log.
- Nails.
- Eye checks if discharge.
When to call your veterinarian
If you are unsure, call your veterinarian, especially with puppies. This list is not complete and does not cover every situation. It is a general reminder of signs many clinics want to hear about.
- Non weight bearing lameness.
- Repeated vomiting diarrhea lethargy.
- Eye injury cloudiness.
- Collapse.
- Seizures.
General educational information only. It is not medical advice and does not replace an exam or treatment plan from a licensed veterinarian. Estimates and tips cannot diagnose illness or emergencies; contact your vet with any health concerns.
Breed Overview
About the Collie
Devoted, graceful, and proud
Group
Herding
Size Category
Large
Lifespan
12-14 years
Full Maturity
18 months
Temperament Traits
DevotedGracefulProudGentleIntelligentLoyal
Also known as
Rough Collie, Smooth Collie
Growth & Height Benchmarks
Expected Adult Weight
50-75lbs
Typical Male
50-75 lbs
24-26" tall
Typical Female
50-75 lbs
22-24" tall
Similar sized breeds
Breed history
Where Collies come from
Rough and Smooth Collies descend from Scottish herding stock, refined into the elegant farm partners immortalized by Lassie and Victorian dog fancy.
They were bred for eye, stamina, and biddability with sheep.
Modern Collies are family dogs. Heritage explains noise sensitivity in some lines and the need for patient training; coat explains your vacuum relationship.
How the Collie calculator works
1
It uses age and current weight
The calculator uses your puppy's current age and weight to estimate adult size. Because puppies grow fastest early on and then slow down as they mature, the estimate adjusts for the stage of growth your Collie is in.
2
It compares against typical breed growth
Collies are usually close to full size by around 18 months. As your puppy gets older and more of its growth is already complete, the estimate usually becomes more reliable.
3
It checks the estimate against the usual range
Most adult Collies fall within a typical weight range of 50-75 lbs. You can use the calculator for younger puppies, but estimates are usually more accurate after about 12 weeks.
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