How long does a Border Collie Mastiff Mix live?

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

Is a Border Collie 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.

Home › Border Collie › Border Collie Mastiff Mix

Border Collie Mastiff Mix

A Border Collie Mastiff mix is a cross between a Border Collie and a Mastiff. Most grow into giant dogs of 75–140 lb and live 9–12 years.

Border Collie, a purebred dog — Border ColliePhoto: Horacio Cambeiro, CC BY-SA 4.0, 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.

Weight75–140 lbcan be 30–230 lb

Height23–26 inat the shoulder

Lifespan9–12 years

SizeGiant

How big does a Border Collie Mastiff Mix get?

Border Collie30–55 lb

The mix75–140 lb

Mastiff120–230 lb

Pounds. The dark band is where most Border Collie 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 18–22 in for the Border Collie 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

Moderate to very 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 Border Collie rates very high and the Mastiff moderate; a puppy may lean either way.

Grooming

Very low to moderate

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

Temperament

The Border Collie is usually described as affectionate, smart, energetic. 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.

Border Collie vs Mastiff vs the mix

Trait	Border Collie	Border Collie Mastiff Mix	Mastiff
Weight	30–55 lb	75–140 lb	120–230 lb
Height	18–22 in	23–26 in	27.5–30 in
Lifespan	12–15 yr	9–12 yr	6–10 yr
Shedding	moderate	moderate	low
Energy	very high	moderate to very high	moderate
Group	Herding	mixed	Working

Questions about the Border Collie Mastiff Mix

How big does a Border Collie Mastiff Mix get?: Most grow to 75–140 pounds and 23–26 inches at the shoulder. Because puppies can take after either parent, the full possible range is 30–230 pounds.
How long does a Border Collie Mastiff Mix live?: A typical lifespan is 9–12 years, the midpoint of the Border Collie (12–15 years) and the Mastiff (6–10 years).
Does a Border Collie 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 Border Collie 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 Border Collie mixes

Other Mastiff mixes

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