Mastiff vs Rat Terrier

Which dog breed is right for you?

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

Rat Terrier

Size
10–25 lbs, 10–18 in
Lifespan
12–18 years
Exercise
High
Grooming
Low
Good with Kids
Yes
Good with Pets
Yes
Intelligent Curious Lively Sensitive

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.

About the Rat Terrier

The Rat Terrier is an American original, developed in the early 20th century on farms across the United States by crossing Fox Terriers with Beagles, Whippets, Italian Greyhounds, and other breeds. They come in two sizes — Miniature (10 to 13 inches, 10 to 18 pounds) and Standard (13 to 18 inches, 12 to 25 pounds) — both with a compact, elegant build. Their short, smooth coat is always pied (white with patches of one or more other colors), and President Theodore Roosevelt is credited with naming the breed after his own terrier cleared the White House of rats.

Temperament & Personality

Rat Terriers are intelligent, curious, and remarkably versatile — combining terrier tenacity with a more biddable, people-oriented temperament than many of their terrier cousins. They bond deeply with their families and are generally good with children, often choosing one person as their particular favorite. Rat Terriers tend to be less dog-aggressive than other terriers, though they retain a strong prey drive toward rodents and small animals.

Pros

  • Excellent farm and homestead dog with natural pest control abilities
  • More trainable and less stubborn than most terrier breeds
  • Minimal grooming needs — short coat requires only occasional brushing
  • Generally healthy breed with a long lifespan of 12 to 18 years

Cons

  • Can be diggers — will excavate impressive holes in gardens and yards
  • High energy level requires daily exercise and mental engagement
  • Prone to patellar luxation, hip dysplasia, and cardiac issues
  • May be wary of strangers and needs early socialization to prevent timidity

A Rat Terrier could be the spirited, loyal companion your household needs — find one on Puplister today.

Available for Adoption

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Frequently Asked Questions

What is the difference between a Mastiff and a Rat Terrier?
The Mastiff is 120–230 lbs, 28–36 in sized while the Rat Terrier is 10–25 lbs, 10–18 in sized. They differ in size (120–230 lbs, 28–36 in vs 10–25 lbs, 10–18 in), lifespan (6–10 years vs 12–18 years), and care requirements.
Which breed is better with kids, Mastiff or Rat Terrier?
Mastiff is generally good with kids. Rat Terrier is generally good with kids.
Which breed lives longer, Mastiff or Rat Terrier?
The Mastiff has a lifespan of 6–10 years while the Rat Terrier has a lifespan of 12–18 years.

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