Why were mastiffs developed in Europe?

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A Labradoodle dog runs energetically through grass with a stick in its mouth, ears flopping and tail raised. — dog A Labradoodle is a cross between a Labrador Retriever and a Poodle, a mix intended to incorporate the Poodle's intelligence and low-shedding coat with a Lab's energy and determination.

Mastiffs were developed in Europe primarily to function as working dogs serving as guardians and war dogs.1

Historically, these powerful dogs were utilized for various roles that leveraged their size and strength:

Guardianship: They were employed to protect estates and property.1
Warfare: Due to their imposing nature, they were used as war dogs in various conflicts.1
Entertainment and Combat: Mastiffs were famously used by Roman invaders to compete in arenas against gladiators and wild animals, such as bears, lions, and tigers. They also participated in bullbaiting and bearbaiting rings in England.1
Specialized Protection: Later, breeds like the Bullmastiff were developed in 19th-century England specifically to discourage poaching on estates and game preserves.1

While these dogs are characteristically gentle with their families, their development was rooted in the need for formidable, physically imposing animals capable of performing demanding protection and combat tasks.1