Smooth Collie Age Calculator: Dog Years to Human Years
A short-coated variety of the Collie, sharing the same herding heritage and gentle temperament as its more famous Rough-coated cousin — here's how a Smooth Collie's age converts to human years.
Smooth Collie age in human years
| Dog years | Human years | Life stage |
|---|---|---|
| 1 | 15 | Adolescent |
| 2 | 24 | Adult |
| 4 | 32 | Adult |
| 5 | 36 | Senior begins |
| 8 | 55 | Senior |
| 12 | 77 | Geriatric |
Figures based on The Royal Kennel Club's published large-breed guidance, as tabulated by Purina UK. For an exact figure, try the Dog Years calculator.
The Smooth Collie is classified by The Royal Kennel Club as a large breed, typically weighing 20–30 kg as an adult. Bred to the same standard as the Rough Collie but with a short, dense coat rather than a long flowing one, the Smooth Collie was historically favoured for droving cattle to market, where a shorter coat was more practical.
What this means for your Smooth Collie
Collie eye anomaly (an inherited eye condition, sometimes present from birth), progressive retinal atrophy, and a drug sensitivity linked to the MDR1 gene (common in herding breeds) are all worth discussing with your vet, particularly before any anaesthesia or medication.
Regular eye screening is worthwhile in this breed given the prevalence of collie eye anomaly, which is often present from a young age.
When is a Smooth Collie considered a senior?
Under The Royal Kennel Club's size-adjusted guidance, large breeds like the Smooth Collie are generally considered senior from around 5 dog years old.
Related reading: Is the ×7 Rule Real? · Dog Life Stages Explained · Signs Your Dog Is Entering Its Senior Years
Compare: vs Rough Collie · vs Border Collie · vs Shetland Sheepdog
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