Bull Terrier Age Calculator: Dog Years to Human Years

Bull Terrier age in human years

Dog years	Human years	Life stage
1	15	Adolescent
2	24	Adult
5	36	Adult
7	47	Senior begins
10	60	Senior
13	74	Geriatric

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

The Bull Terrier is classified by The Royal Kennel Club as a medium breed, typically weighing 24–32 kg as an adult, with a median life expectancy of around 12.0 years, according to a 2024 analysis of UK veterinary records by Dogs Trust. Instantly recognisable by its distinctive egg-shaped head, the Bull Terrier is playful, stubborn, and full of energy, with a mischievous streak that endears it to devoted fans.

What this means for your Bull Terrier

Hereditary nephritis, an inherited kidney disease, is a known concern in the breed, so regular kidney function checks are worthwhile as your Bull Terrier ages. Deafness, particularly in white-coated dogs, and skin allergies are also more common in the breed.

Heart conditions including mitral valve dysplasia are reported occasionally, so a vet check if you notice reduced stamina or unusual breathing is a sensible precaution.

When is a Bull Terrier considered a senior?

Under The Royal Kennel Club's size-adjusted guidance, medium breeds like the Bull Terrier are generally considered senior from around 7 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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