Question: What 's the breed that the lightest dog in terms of weight descended from ?

text: Fox Terrier
Modern breeds -- Descendant breeds

Fox Terriers are two different breeds of the terrier dog type: the Smooth Fox Terrier and the Wire Fox Terrier. Both of these breeds originated in the 19th century from a handful of dogs who are descended from earlier varieties of British terriers, and are related to other modern white terrier breeds. In addition, a number of breeds have diverged from these two main types of fox terrier and have been recognised separately, including the Jack Russell Terrier, Miniature Fox Terrier and Rat Terrier. The Wire and Smooth Fox Terriers share similar characteristics, the main differences being in the coat and markings. They have been successful in conformation shows, more prominently in America than their homeland.
Breed Country of Origin Height Weight Notes
Brazilian Terrier Brazil 14-16 inches ( 36-41 cm ) 15-20 pounds ( 6.8-9.1 kg ) Fox Terriers were brought to Brazil in the 18th century . They were crossed with Chihuahuas , Miniature Pinschers and other small breeds during the following century and have since been used for hunting and ratting
Chilean Rat Terrier Chile 11-15 inches ( 28-38 cm ) 6-8 pounds ( 2.7-3.6 kg ) European settlers brought Fox Terriers with them to South America in the 18th century to act as ratters . The breed was crossed with native dogs and was developed in rural communities
Jack Russell Terrier England 10-15 inches ( 25-38 cm ) 14-18 pounds ( 6.4-8.2 kg ) Developed by Reverend John Russell early in the 19th century . Following his death , the line was continued in the early 20th century as a smaller working variety of the Fox Terrier . The Jack Russell Terrier has two descendant breeds of its own , the Parson Russell Terrier and the Russell Terrier
Japanese Terrier Japan 12-13 inches ( 30-33 cm ) 6-8 pounds ( 2.7-3.6 kg ) This breed is descended from the Fox Terriers brought to Japan by the Dutch in the early 18th century . It was mated with existing Japanese breeds and developed in the towns of Yokohama and Kobe
Miniature Fox Terrier Australia 9.5-12 inches ( 24-30 cm ) In proportion to height Developed in Australia by the late 19th century , they were developed to hunt rabbits and rats . Considered to be similar to the American Toy Fox Terrier
Ratonero Bodeguero Andaluz Spain 14-17 inches ( 36-43 cm ) 15-18 pounds ( 6.8-8.2 kg ) Developed in Andalusia , Spain ; the breed was created to eradicate rats and mice in wine cellars known as bodegas in their homeland . Their name translates to Wine Cellar Rat Hunting Dog of Andalusia
Rat Terrier United States 8-23 inches ( 20-58 cm ) 4-35 pounds ( 1.8-15.9 kg ) Developed as a cross between the Fox Terrier , English White Terrier and other common terriers during the time of early immigration to America . The breed comes in three sizes : toy , which is up to 8 inches ( 20 cm ) tall ; miniature , which is up to 14 inches ( 36 cm ) tall ; and standard , which is more than 14 inches ( 36 cm ) tall
Teddy Roosevelt Terrier United States 8-15 inches ( 20-38 cm ) 12-35 pounds ( 5.4-15.9 kg ) Recognised by the United Kennel Club , this breed was named in honor of Theodore D. Roosevelt , although he was not involved in its development
Tenterfield Terrier Australia 10-12 inches ( 25-30 cm ) In proportion to height Established as a working dog after terriers were brought to Australia by early immigrants . Used to eliminate vermin such as rats , rabbits and foxes , it is popular among the farming community
Toy Fox Terrier United States 8-11 inches ( 20-28 cm ) 3-7 pounds ( 1.4-3.2 kg ) Created from the Smooth Fox Terrier and bred with a variety of toy breeds including Miniature Pinschers , Italian Greyhounds , Chihuahuas and Manchester Terriers . The breed was recognised by the American Kennel Club in 2003