Australian Shepherd vs Mastiff

Which dog breed is right for you?

Australian Shepherd

Size
40–65 lbs, 18–23 in
Lifespan
12–15 years
Exercise
Very High
Grooming
Moderate
Good with Kids
Yes
Good with Pets
Yes
Smart Exuberant Work-oriented Loyal

Mastiff

Size
120–230 lbs, 28–36 in
Lifespan
6–10 years
Exercise
Low
Grooming
Low
Good with Kids
Yes
Good with Pets
Yes
Gentle Dignified Brave Patient

About the Australian Shepherd

Despite its name, the Australian Shepherd was actually developed in the western United States during the 19th century, likely from Basque shepherd dogs that passed through Australia on their way to America. These versatile herding dogs stand 18–23 inches tall and weigh 40–65 pounds, with a medium-length double coat that comes in four recognized colors — black, blue merle, red, and red merle — often with striking copper and white markings. Their coats are weather-resistant and require regular brushing to manage moderate-to-heavy shedding.

Temperament & Personality

Australian Shepherds are brilliant, energetic, and deeply devoted to their families — they thrive when given a purpose and can become anxious or destructive without one. They are excellent with children, often naturally herding and watching over younger family members. Aussies are typically friendly with other dogs but can be reserved with strangers, and their intelligence makes them exceptionally responsive to training.

Pros

  • One of the most intelligent and trainable breeds — excels in agility, flyball, and herding
  • Loyal and affectionate family companion who bonds closely with all household members
  • Versatile working dog adaptable to ranch life, sport, or active suburban living
  • Beautiful, eye-catching coat with striking color variations including heterochromia

Cons

  • Demands extensive daily exercise and mental engagement — easily 1–2 hours minimum
  • Heavy shedding, especially during seasonal coat changes
  • May herd children, cats, and other pets by nipping at heels
  • Prone to epilepsy, hip dysplasia, and the MDR1 gene mutation affecting drug sensitivity

Aussies are incredible partners for active families — discover adoptable Australian Shepherds waiting for you on Puplister.

About the Mastiff

The English Mastiff is one of the most ancient and massive dog breeds, with roots tracing back over 2,000 years to ancient Britain and possibly earlier Molosser-type dogs of Asia. Males commonly weigh 160 to 230 pounds and stand 30 inches or taller at the shoulder, making them among the heaviest domestic dogs in the world. Their short, dense double coat comes in fawn, apricot, or brindle — always with a distinctive dark mask on the face.

Temperament & Personality

Despite their imposing size, Mastiffs are famously gentle, calm, and deeply loyal — often called "gentle giants" with good reason. They are patient and protective with children in their family, though their sheer mass means supervision around small kids is wise. Mastiffs tend to be reserved with strangers but rarely aggressive, preferring to position themselves between their family and any perceived threat.

Pros

  • Naturally protective without needing guard training
  • Surprisingly low energy indoors — content to lounge for hours
  • Gentle and patient temperament ideal for families
  • Short coat requires only basic weekly brushing

Cons

  • Massive food bills — adult Mastiffs eat 6 to 10 cups of food daily
  • Shorter lifespan of 6 to 10 years typical of giant breeds
  • Prone to hip dysplasia, bloat (gastric torsion), and heart conditions
  • Excessive drooling is a constant reality with this breed

Ready to welcome a magnificent gentle giant into your home? Explore Mastiff adoption opportunities on Puplister.

Available for Adoption

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Frequently Asked Questions

What is the difference between a Australian Shepherd and a Mastiff?
The Australian Shepherd is 40–65 lbs, 18–23 in sized while the Mastiff is 120–230 lbs, 28–36 in sized. They differ in size (40–65 lbs, 18–23 in vs 120–230 lbs, 28–36 in), lifespan (12–15 years vs 6–10 years), and care requirements.
Which breed is better with kids, Australian Shepherd or Mastiff?
Australian Shepherd is generally good with kids. Mastiff is generally good with kids.
Which breed lives longer, Australian Shepherd or Mastiff?
The Australian Shepherd has a lifespan of 12–15 years while the Mastiff has a lifespan of 6–10 years.

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