Bullmastiff vs Cocker Spaniel

Which dog breed is right for you?

Bullmastiff

Size
100–130 lbs, 24–27 in
Lifespan
7–9 years
Exercise
Moderate
Grooming
Low
Good with Kids
Yes
Good with Pets
No
Loyal Calm Protective Brave

Cocker Spaniel

Size
20–30 lbs, 14–15 in
Lifespan
10–14 years
Exercise
Moderate
Grooming
High
Good with Kids
Yes
Good with Pets
Yes
Happy Gentle Smart Trusting

About the Bullmastiff

The Bullmastiff was developed in 19th-century England by crossing Bulldogs with Mastiffs — the goal was a powerful, silent guardian capable of tracking and pinning poachers on large estates without mauling them. Standing 24–27 inches tall and weighing 100–130 pounds, the Bullmastiff is a massive, muscular dog with a broad head, dark muzzle, and an imposing physical presence. Their short, dense coat comes in fawn, red, or brindle — always with a black mask — and sheds moderately with minimal grooming requirements.

Temperament & Personality

Bullmastiffs are confident, loyal, and naturally protective — they are alert guardians who rely on their size and intimidating presence rather than excessive barking to deter intruders. Despite their imposing appearance, they are gentle and affectionate with their families, showing particular patience and tenderness with children. They are typically calm and quiet indoors, content to lie at their owner's feet, but they can be territorial with unfamiliar dogs and require early, consistent socialization.

Pros

  • Naturally protective — their imposing presence alone is an effective deterrent
  • Surprisingly low-energy indoors, adapting well to a calm household routine
  • Gentle and affectionate with family members, including children
  • Minimal grooming needs with their short, easy-care coat

Cons

  • Short lifespan averaging only 7–9 years
  • Prone to bloat, hip and elbow dysplasia, lymphoma, and mast cell tumors
  • Significant drooling, especially around mealtimes and in warm weather
  • Their sheer size and strength require an experienced owner capable of managing 100+ pounds of dog

A Bullmastiff offers protection and companionship in equal measure — explore adoptable Bullmastiffs on Puplister and find your gentle giant.

About the Cocker Spaniel

The American Cocker Spaniel — the smallest of the sporting breeds — descended from English Cocker Spaniels brought to North America in the late 1800s and was developed as both a skilled bird flusher and an adoring family companion. Standing 13.5–15.5 inches tall and weighing 20–30 pounds, the Cocker Spaniel is known for its luxurious, silky coat that comes in black, ASCOB (any solid color other than black), and parti-color varieties. Their large, soulful dark eyes and perpetually wagging tail have made them one of America's most beloved breeds for decades.

Temperament & Personality

Cocker Spaniels are the quintessential happy dog — eager to please, gentle, and brimming with affection for everyone they meet. They thrive on human companionship and are wonderful with children, other dogs, and even cats when properly introduced. Their sensitive nature means they respond best to positive reinforcement and can become anxious or submissive if treated harshly.

Pros

  • Gentle, merry temperament makes them one of the best breeds for families with young children
  • Highly trainable and eager to please — excel in obedience and agility
  • Adaptable to apartment living provided they receive daily walks and play
  • Friendly with strangers, other dogs, and household pets — rarely aggressive

Cons

  • Coat requires professional grooming every 4–6 weeks plus daily brushing to prevent matting
  • Prone to chronic ear infections due to long, heavy ear flaps that trap moisture
  • High incidence of eye conditions including cataracts, glaucoma, and cherry eye
  • Some lines suffer from "rage syndrome" — sudden unprovoked aggression linked to poor breeding

Ready to welcome a joyful, tail-wagging Cocker Spaniel into your life? Find your perfect match on Puplister.

Available for Adoption

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Frequently Asked Questions

What is the difference between a Bullmastiff and a Cocker Spaniel?
The Bullmastiff is 100–130 lbs, 24–27 in sized while the Cocker Spaniel is 20–30 lbs, 14–15 in sized. They differ in size (100–130 lbs, 24–27 in vs 20–30 lbs, 14–15 in), lifespan (7–9 years vs 10–14 years), and care requirements.
Which breed is better with kids, Bullmastiff or Cocker Spaniel?
Bullmastiff is generally good with kids. Cocker Spaniel is generally good with kids.
Which breed lives longer, Bullmastiff or Cocker Spaniel?
The Bullmastiff has a lifespan of 7–9 years while the Cocker Spaniel has a lifespan of 10–14 years.

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