The fox-terrier is described as the best dog breed for mobile and sporty people due to their energetic, joyful, and clever nature. Originally bred for hunting small animals like foxes and badgers, fox-terriers have a large physical strength and are fearless attackers. During World War 1 and Antarctic expeditions in the 1920s-1930s, fox-terriers served countries with their skills and barking was useful as watchdog for apartments. The breed has been mentioned as far back as 55 BC and was officially developed in 1570 AD.