Medium-sized dogs range in height from 32.5 cm (13 inches) to 60 cm (2 feet) tall at the highest point of their shoulder, according to "Encyclopedia of Dog Breeds." Their weight will depend on how stocky or muscular they are in build. Even purebred dogs can vary in height and weight from their breed average.
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According to the American Kennel Club (AKC), beagles were America's fifth most popular breed of dog in 2010. They have short, easy-care coats, are friendly, intelligent and good with children, according to the "ASPCA Complete Guide to Dogs." Beagles average 32.5 cm to 37.5 cm (13 to 15 inches) in height and from 8.16 to 13.6 kg (18 to 30 lb).
The boxer is America's sixth most popular breed and Britain's ninth most popular. They average in height from 55 to 58.75 (22 to 23.5 inches) tall. Developed in Germany in the 1800s for the now-banned "sport" of bull baiting (where a dog would fight a bull), the boxer makes a great, although energetic, pet.
Also known as the English bulldog, Bred in England in the 1800s, original bulldogs were much taller and long-limbed than modern bulldogs. Now they average 30 to 40 cm (12 to 16 inches) tall and 22.7 kg (50 lb). They often have health problems.
The AKC considers both the American and English cocker spaniels as two types of the same breed. Combined, they are the 23rd most popular breed in America but the English is the third most popular dog breed in the UK. Originally bred to be hunting dogs, they now are mostly pets. They can average from 33.5 to 42.5 cm (13 to 17 inches) tall and a weight of 6 to 11 kg (14 to 24 lb).
Despite the name, this breed originated in America and is the 28th most popular in its home country. Originally bred in the 1800s to herd sheep, the "Aussie" also excels in dog sports such as agility and flyball. They average 55 to 57.5 cm (22 to 23 inches) in height and weigh from 18 to 26 kg (40 to 65 lb), according to "Encyclopedia of Dog Breeds."
Another hunting dog that has been able to make the transition to family pet, the Brittany originated in France in the 1800s. It averages 43.75 to 51.25 cm (17.5 to 20.5 inches) tall and weighs 13 to 18 kg (30 to 40 lb).
This is the largest terrier breed, averaging 50 to 57.5 cm (20 to 23 inches) tall with a weight of 22.7 kg (50 lb). They originated in England in the 1800s. Despite their friendly appearance, they make excellent guard dogs.
This is the tenth most popular dog breed in the UK. Originally bred to herd sheep in the unforgiving border counties between Scotland and England, they excel in all dog sports. They average 45 to 57.5 cm (18 to 23 inches) in height but weigh only about 13 to 20 kg (30 to 45 lb).
The most famous bull terrier was Spuds Mackenzie of US beer commercials in the 1980s. This British breed averages 52.5 to 55 cm (21 to 22 inches) tall with a weight of 22 to 31 kg (50 to 70 lb).
Staffordshire bull terrier
The "Staffie" is the fifth most popular breed in England. Originally bred for dog fighting and bull baiting, they became guard dogs and pets. They are nicknamed "nanny dogs" in the UK because they are so good with children. They average 42.5 to 47.5 cm (17 to 19 inches) tall and weigh about 13 to 18 kg (30 to 40 lb).
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