Use this Collie puppy weight calculator to predict how big your puppy will get. Collies are a herding breed that typically reaches full size by around 12-18 months.
Enter your puppy's current weight and age to predict their adult size
Estimates based on breed growth curves. Individual dogs vary with genetics and nutrition — check with your vet for a personalized read.
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| Age | Weight |
|---|---|
| Birth | 1 to 3 lbs |
| 2 Months | 5 to 11 lbs |
| 3 Months | 10 to 19 lbs |
| 4 Months | 15 to 26 lbs |
| 5 Months | 20 to 34 lbs |
| 6 Months | 25 to 41 lbs |
| 7 Months | 30 to 49 lbs |
| 9 Months | 35 to 56 lbs |
| 10 Months | 40 to 64 lbs |
| 1 Year | 45 to 71 lbs |
| 1.5 Years | 49 to 75 lbs |
| 2 Years | 50 to 75 lbs |
Estimated from typical large-breed growth curves and the Collie's adult weight range. Individual puppies vary — use the calculator above for a prediction based on your puppy's actual current weight.
New breed data, growth tips, and puppy-parenting insights, plus our free printable puppy growth tracker.
Collies are prone to Collie Eye Anomaly (CEA), an inherited condition detectable by ophthalmologic exam at 5-6 weeks of age that can affect vision; and the MDR1 gene mutation, which causes sensitivity to certain common medications — both are worth testing for. As a deep-chested breed, Collies also carry bloat risk, and hip dysplasia occurs, though less frequently than in many other herding breeds.
Splitting meals into two or more feedings rather than one large one helps reduce bloat risk in this deep-chested breed; some breed resources note that adding meat to the diet has been associated with lower bloat risk as well.
The Rough Collie's dense double coat needs brushing several times a week to prevent matting; the Smooth Collie's short coat needs only occasional brushing.
Highly trainable and eager to please — Collies excel at obedience, agility, and herding trials, and thrive on close involvement with family activities rather than being left to their own devices.
The Collie was developed in Scotland and England as a sheep-herding dog, entering the written record around 1800. Queen Victoria's enthusiasm for the breed in the 1860s drove early popularity, but it was Eric Knight's 1940 novel Lassie Come-Home — and the films and TV series that followed — that made the Collie one of the most recognizable dog breeds in American pop culture.
Collies come in two coat varieties recognized as the same breed: the long-haired Rough Collie (the "Lassie" type) and the short-haired Smooth Collie, which has seen a recent resurgence as a guide dog thanks to its lower grooming demands.
