Harrier in human years

Size class: Medium (10–25 kg / 22–55 lb) · Average lifespan: 12–15 years · Senior age: 8+ · AKC group: Hound

Breed

Your dog's age (years)

In human years

Full age chart

Year-by-year human-equivalent ages for a medium-sized breed like the Harrier.

Harrier age	Human-equivalent	Life stage
1 year	15 human years	Puppy/Adolescent
2 years	24 human years	Adult
3 years	29 human years	Adult
4 years	34 human years	Adult
5 years	39 human years	Adult
6 years	44 human years	Adult
7 years	49 human years	Adult
8 years	54 human years	Senior
9 years	59 human years	Senior
10 years	64 human years	Senior
11 years	69 human years	Senior
12 years	74 human years	Senior
13 years	79 human years	Senior
14 years	84 human years	Senior
15 years	89 human years	Senior
16 years	94 human years	Senior
17 years	99 human years	Senior
18 years	104 human years	Senior

About the Harrier's ageing

The Harrier is a medium breed with an average lifespan of 12 to 15 years. Like other medium-sized dogs, the Harrier ages most rapidly in its first two years — reaching the rough equivalent of a 24-year-old human by its second birthday — and then ages more steadily.

Harriers typically reach senior status around 8 years old. From that point on, screening for joint, dental and weight-related conditions becomes especially valuable. Medium-class breeds tend to be prone to dental issues and weight gain in middle age, so dental care and portion control pay off.

If your Harrier is approaching the high end of its expected lifespan (15+ years), you're already doing something right. Continue to monitor mobility, appetite, weight and behaviour — and adjust food, exercise and vet check-up frequency accordingly.