Mastiff
VS
Sealyham Terrier
Mastiff vs Sealyham Terrier
Compare Mastiff and Sealyham Terrier side by side and get a clear picture of what sets the breeds apart. Explore differences in size, weight, temperament, activity level, and other key traits to more easily decide which breed best fits your lifestyle and circumstances.
Characteristic
Mastiff
Sealyham Terrier
Breed type
Purebred
Purebred
Height
70 – 91 cm
30 – 31 cm
Weight
75 – 110 kg
8 – 9 kg
Life expectancy
10 – 12 years
12 – 14 years
Child friendly
3/5
4/5
Energy level
3/5
4/5
Intelligence
4/5
4/5
Trainability
3/5
3/5
Health
2/5
4/5
Grooming needs
3/5
3/5
Shedding
3/5
1/5
Barking level
3/5
4/5
Aggressiveness
2/5
2/5
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Characteristics
Mastiff
Super smart
Giant
Sealyham Terrier
Great with kids
High energy
Super smart
Small
Summary
About Mastiff
The Mastiff is a giant, heavily built guardian dog, calm and dignified yet deeply devoted to its family. It is watchful rather than aggressive, needs gentle, consistent training, moderate exercise, and space. Its short coat is easy to maintain, but drool, health care, and costs are significant.
About Sealyham Terrier
Compact Welsh terrier bred for hunting but affectionate and calm at home. Sturdy, low body with a distinctive white double coat, beard and eyebrows needing regular grooming. Intelligent, independent and moderate in exercise needs, it suits engaged families; the breed is now relatively rare.
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