West Highland White Terrier Age Calculator: Dog Years to Human Years

West Highland White Terrier age in human years

Dog years	Human years	Life stage
1	15	Adolescent
2	24	Adult
6	40	Adult
10	56	Senior begins
13	68	Senior
15	76	Geriatric

Figures based on The Royal Kennel Club's published small-breed guidance, as tabulated by Purina UK. For an exact figure, try the Dog Years calculator.

The West Highland White Terrier ("Westie") is classified by The Royal Kennel Club within the smaller ageing band, typically weighing 7–10 kg as an adult, with a median life expectancy of around 13.4 years, according to a 2024 analysis of UK veterinary records by Dogs Trust. Originally bred in Scotland to hunt vermin, the Westie is a hardy, confident terrier with a distinctive bright white double coat.

What this means for your Westie

The breed's biggest health concern by far is skin allergies — often nicknamed "Westie skin" — which can cause itching, redness, and recurring infections, and tend to need ongoing management rather than a one-off cure. Identifying and avoiding trigger foods or environmental allergens, alongside vet-recommended shampoos or medication, becomes an important part of caring for an ageing Westie.

The breed is also prone to luxating patella (a dislocating kneecap) and Legg-Calvé-Perthes disease, a hip condition that typically appears in younger dogs but can have lasting effects on joint health into old age. Regular grooming to strip the harsh double coat is also part of routine Westie care.

When is a West Highland White Terrier considered a senior?

Under The Royal Kennel Club's size-adjusted guidance, small breeds like the West Highland White Terrier are generally considered senior from around 10 dog years old.

Related reading: Is the ×7 Rule Real? · Dog Life Stages Explained · Signs Your Dog Is Entering Its Senior Years

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