Spanish Mastiff
VS
Sealyham Terrier
Spanish Mastiff vs Sealyham Terrier
Compare Spanish 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
Spanish Mastiff
Sealyham Terrier
Breed type
Purebred
Purebred
Height
72 – 85 cm
30 – 31 cm
Weight
70 – 120 kg
8 – 9 kg
Life expectancy
8 – 12 years
12 – 14 years
Child friendly
4/5
4/5
Energy level
3/5
4/5
Intelligence
3/5
4/5
Trainability
3/5
3/5
Health
4/5
4/5
Grooming needs
2/5
3/5
Shedding
3/5
1/5
Barking level
3/5
4/5
Aggressiveness
3/5
2/5
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Characteristics
Spanish Mastiff
Great with kids
Low grooming
Giant
Sealyham Terrier
Great with kids
High energy
Super smart
Small
Summary
About Spanish Mastiff
Large, powerful livestock guardian, calm and observant yet strongly protective. Quiet and laid back at home if well exercised, deeply loyal with family and usually reserved with strangers. Independent and thoughtful, it suits experienced owners with space, structure and early socialisation.
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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