Question: What do Boykin Spaniel and English White Terrier have in common?

Context articles: Fox Terrier
Teddy Roosevelt Terrier
Parson Russell Terrier
Boykin Spaniel
James Hinks
Welsh Springer Spaniel
Craniomandibular osteopathy
Bull Terrier (Miniature)
English White Terrier
Feist (dog)

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.
The Teddy Roosevelt Terrier is a small to medium-sized American hunting terrier.
 Lower-set with shorter legs, more muscular, and heavier bone density than its cousin the American Rat Terrier.
 There is much diversity in the history of the Teddy Roosevelt Terrier breed and it shares a common early history with the American Rat Terrier, Fox Paulistinha and Tenterfield Terrier.
 It is said the Rat Terrier background stems from the terriers or other dogs that were brought over by early English and other working class immigrants.
 Since the breed was a farm, hunting and utility dog there was little to no planned breeding other than breeding dogs with agreeable traits to each other in order to produce the desired work ethic in the dog.
 It is assumed that the Feist (dog), Bull Terrier, Smooth Fox Terrier, Manchester Terrier, Whippet, Italian Greyhound, the now extinct English White Terrier, Turnspit dog and or Wry Legged Terrier all share in the Teddy Roosevelt Terrier's ancestry.
 These early Ratting Terriers were then most likely bred to the Beagle or Beagle cross bred dogs (for increased scenting ability) and other dogs.
 Maximizing the influences from these various breeds provides the modern Teddy Roosevelt Terrier with a keen sense of awareness and prey drive, an acute sense of smell and a very high intellect.
 Although they tend to be aloof with strangers they are devoted companion dogs with a strong desire to please and be near their owners side at all times.
The Parson Russell Terrier is a breed of small white terrier that was the original Fox Terrier of the 18th century.
 The breed is named after the person credited with the creation of this type of dog, the Reverend John "Jack" Russell.
 It is the recognised conformation show variety of the Jack Russell Terrier and was first recognised in 1990 in the United Kingdom as the Parson Jack Russell Terrier.
 In America, it was first recognised as the Jack Russell Terrier in 1997.
 The name was changed to its current form in 1999 in the UK and by 2008 all international kennel clubs recognised it under the new name.
The Boykin Spaniel is a medium-sized breed of dog, a Spaniel bred for hunting wild turkeys and ducks in the Wateree River Swamp of South Carolina, in the United States.
 It is the state dog of South Carolina, where it was discovered and further developed by hunters in the 1900s.
 1 September is Boykin Spaniel Day in South Carolina.
James Hinks (born 1829 in Mullingar, Ireland - died 1878 Birmingham, England) bred and named the English Bull Terrier in the 1860s, as well as the English White Terrier.
 He lived most of his life in Birmingham and died there in 1878.
The Welsh Springer Spaniel is a breed of dog and a member of the spaniel family.
 Thought to be comparable to the old Land Spaniel, they are similar to the English Springer Spaniel and historically have been referred to as both the Welsh Spaniel and the Welsh Cocker Spaniel.
 They were relatively unknown until a succession of victories in dog trials by the breed increased its popularity.
 Following recognition by The Kennel Club in 1902, the breed gained the modern name of Welsh Springer Spaniel.
 The breed's coat only comes in a single colour combination of white with red markings, usually in a piebald pattern.
 Loyal and affectionate, they can become very attached to family members and are wary of strangers.
 Health conditions are limited to those common among many breeds of dog, although they are affected more than average by hip dysplasia and some eye conditions.
 They are a working dog, bred for hunting, and while not as rare as some varieties of spaniel, they are rarer than the more widely known English Springer Spaniel with which they are sometimes confused.
Craniomandibular osteopathy, also known as lion's jaw, is a developmental disease in dogs causing extensive bony changes in the mandible and skull.
 In this disease, a cyclical resorption of normal bone and replacement by immature bone occurs along the inner and outer surfaces of the affected bones.
 It usually occurs between the ages of 3 and 8 months.
 Breeds most commonly affected include the West Highland White Terrier, Scottish Terrier, Cairn Terrier, and Boston Terrier.
 It is rare in large-breed dogs, but it has been reported.
 Symptoms include firm swelling of the jaw, drooling, pain, and difficulty eating.
The Bull Terrier (Miniature) is a breed with origins in the extinct English White Terrier, the Dalmatian and the Bulldog.
 The first existence is documented 1872 in "The Dogs of British Island".
The English white terrier (also known as the White English terrier or Old English terrier) is an extinct breed of dog.
 The English White terrier is the failed show ring name of a pricked-ear version of the white fox-working terriers that have existed in Great Britain since the late 18th Century.
A Feist is a small hunting dog, descended from the terriers brought over to the United States by English miners and other working class immigrants.
 These terriers probably included crosses between the Smooth Fox Terrier, the Manchester Terrier and the now extinct English White Terrier.
 These dogs were used as ratters, and gambling on their prowess in killing rats was a favorite hobby of their owners.
 Some of these dogs have been crossed with Whippets or Italian Greyhounds (for speed) and Beagles (for hunting ability) - extending the family to include a larger variety of purpose than the original ratter, or Rat Terrier.