How long does a Australian Shepherd Mastiff Mix live?

A typical lifespan is 9–12 years, the midpoint of the Australian Shepherd (12–15 years) and the Mastiff (6–10 years).

Is a Australian Shepherd Mastiff Mix easy to train?

Trainability is moderate to very high, based on how both parent breeds respond to training. Start early and keep sessions short.

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Australian Shepherd Mastiff Mix

A Australian Shepherd Mastiff mix is a cross between a Australian Shepherd and a Mastiff. Most grow into giant dogs of 80–150 lb and live 9–12 years.

Australian Shepherd, a purebred dog — Australian ShepherdPhoto: Christoph Aeschlimann, CC BY-SA 3.0, source

Mastiff, a purebred dog — MastiffPhoto: Pleple2000, CC BY-SA 3.0, source

Photos show the purebred parents. There is no single look for a mix: puppies in one litter can resemble either side.

Weight80–150 lbcan be 40–230 lb

Height23–26 inat the shoulder

Lifespan9–12 years

SizeGiant

How big does a Australian Shepherd Mastiff Mix get?

Australian Shepherd40–65 lb

The mix80–150 lb

Mastiff120–230 lb

Pounds. The dark band is where most Australian Shepherd Mastiff Mix dogs end up; the light band is the full range between the smallest and largest parent.

Height runs 23–26 inches at the shoulder, against 18–23 in for the Australian Shepherd and 27.5–30 in for the Mastiff. The parents differ a lot in size, so litters vary more than usual. Breeders normally use the larger breed as the mother to keep whelping safe.

Coat, energy and training

Shedding

Moderate

Neither parent has a low-shedding coat, so expect dog hair around the house and seasonal heavy shedding.

Energy

High

Plan on long daily walks plus real exercise, such as running, fetch or a sport. A yard alone will not tire this dog out.

Trainability

Moderate to very high

The Australian Shepherd rates very high and the Mastiff moderate; a puppy may lean either way.

Grooming

Low

A weekly brush and the odd bath keep the coat in shape.

Temperament

The Australian Shepherd is usually described as smart, work-oriented, exuberant. The Mastiff as courageous, dignified, good-natured. A mix can take after either parent or land in between. If you can, meet both parents of a puppy before you choose.

Australian Shepherd vs Mastiff vs the mix

Trait	Australian Shepherd	Australian Shepherd Mastiff Mix	Mastiff
Weight	40–65 lb	80–150 lb	120–230 lb
Height	18–23 in	23–26 in	27.5–30 in
Lifespan	12–15 yr	9–12 yr	6–10 yr
Shedding	moderate	moderate	low
Energy	high	high	moderate
Group	Herding	mixed	Working

Questions about the Australian Shepherd Mastiff Mix

How big does a Australian Shepherd Mastiff Mix get?: Most grow to 80–150 pounds and 23–26 inches at the shoulder. Because puppies can take after either parent, the full possible range is 40–230 pounds.
How long does a Australian Shepherd Mastiff Mix live?: A typical lifespan is 9–12 years, the midpoint of the Australian Shepherd (12–15 years) and the Mastiff (6–10 years).
Does a Australian Shepherd Mastiff Mix shed?: Shedding is moderate. Neither parent has a low-shedding coat, so expect dog hair around the house and seasonal heavy shedding.
Is a Australian Shepherd Mastiff Mix easy to train?: Trainability is moderate to very high, based on how both parent breeds respond to training. Start early and keep sessions short.

Other Australian Shepherd mixes

Other Mastiff mixes

Figures are calculated from each parent breed's standard height, weight and life expectancy. How we calculate.