Australian Cattle Dog age in human years

Australian Cattle Dogs are a medium breed. Here is the full age chart and what each stage means.

Updated October 2026Numbers calculated for this page

Australian Cattle Dogs are a medium breed (typically 35–50 lb), so they age about 5 human years for every dog year after age two. A 5-year-old Australian Cattle Dog is about 39 in human years, and the senior years usually start around age 10.

12–16 yrstypical life expectancy

94human years at age 16

~10senior years begin

35–50 lbtypical adult weight

Australian Cattle Dog age chart

Dog age	Human years	Life stage
1 year	15	Young adult
2 years	24	Young adult
3 years	29	Mature adult
4 years	34	Mature adult
5 years	39	Mature adult
6 years	44	Mature adult
7 years	49	Mature adult
8 years	54	Mature adult
9 years	59	Mature adult
10 years	64	Mature adult
11 years	69	Senior
12 years	74	Senior
13 years	79	Senior
14 years	84	Senior
15 years	89	Golden years
16 years	94	Golden years
17 years	99	Golden years
18 years	104	Golden years

Uses the common size-based chart: the first year equals about 15 human years, the second adds about 9, and each year after that adds 4 (small), 5 (medium), 6 (large) or 7 (giant). It is an estimate, not a medical measure.

What each stage means for a Australian Cattle Dog

Young adult (1–3): still learning. Keep training consistent and set the healthy weight now; for a Australian Cattle Dog that is usually within 35–50 lb.
Mature adult (3–9): yearly checkups, dental care and steady exercise. Watch the waistline as activity drops.
Senior (10+): many vets suggest checkups every six months, plus attention to joints, teeth and weight changes.

How much a Australian Cattle Dog eats

A spayed or neutered adult around 42 lb needs roughly 1,030 calories a day, about 2.7 cups of a typical 380-calorie-per-cup dry food. See the full feeding guide for a 40 lb dog.

Planning the budget? See what a Australian Cattle Dog costs per year.

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Other medium breeds

Standard Poodle Bulldog Beagle Dachshund Pembroke Welsh Corgi Australian Shepherd Siberian Husky English Springer Spaniel Brittany Cocker Spaniel

Any medium dog: see how old a 7-year-old medium dog is or try the dog age calculator.

Questions people ask

How old is a 10-year-old Australian Cattle Dog in human years?

About 64, using the medium-breed chart.

How long do Australian Cattle Dogs live?

Typically 12 to 16 years, though genetics, weight, diet and vet care all matter.

When is a Australian Cattle Dog considered a senior?

Around age 10, roughly the last quarter of the breed's typical lifespan.

The Paw Plan shares general pet care information, not veterinary advice. Figures on this page are estimates calculated from the assumptions shown. Every pet is different, so check with your vet about yours.