Mastiff

Working
giant size
6-10 years

Mastiffs are massive working dogs known for a calm temperament, a steady presence, and a natural guarding instinct. These dogs are gentle with family and prefer a relaxed lifestyle with steady walks and plenty of downtime. Because of their size, early training for manners is critical—polite leash walking and calm greetings keep daily life manageable. Mastiffs can drool and may be sensitive to heat. Thoughtful care helps a Mastiff become an affectionate giant and a quiet guardian of the home.

Quick facts

  • Group: Working
  • Size: giant
  • Lifespan: 6-10 years
  • Weight: 120-230 lbs
  • Height: 27.5-30+ in
  • Temperament: Calm, Gentle, Protective, Steady

History

Mastiff-type dogs have ancient roots in Europe, historically used for guarding and protection. The modern English Mastiff was refined over time into a large companion guardian with a calmer temperament.

Care tips

  • Train manners early—giant strength requires reliable handling skills.
  • Provide joint-friendly exercise and keep weight under control.
  • Watch for overheating; large dogs do best in cooler temperatures.
  • Discuss bloat risk prevention strategies with your veterinarian.
  • Prepare for drool and keep skin folds clean and dry.