Canine degenerative myelopathy, also known as chronic degenerative radiculomyelopathy, is an incurable, progressive disease of the canine spinal cord that is similar in many ways to amyotrophic lateral sclerosis (ALS).
 Onset is typically after the age of 7 years and it is seen most frequently in the German shepherd dog, Pembroke Welsh corgi, and boxer dog, though the disorder is strongly associated with a gene mutation in SOD1 that has been found in 43 breeds as of 2008, including the wire fox terrier, Chesapeake Bay retriever, Rhodesian ridgeback, and Cardigan Welsh corgi.
 Progressive weakness and incoordination of the rear limbs are often the first signs seen in affected dogs, with progression over time to complete paralysis.
 Myelin is an insulating sheath around neurons in the spinal cord.
 One proposed cause of degenerative myelopathy is that the immune system attacks this sheath, breaking it down.
 This results in a loss of communication between nerves in lower body of the animal and the brain.
The 2005 Chesapeake Bay crossing study (also known as the Task Force on Traffic Capacity Across the Chesapeake Bay) was a study conducted by the state of Maryland in 2005 in order to explore the possibility of building a new crossing of the Chesapeake Bay.
 The crossing would either be an entirely new crossing that would complement the existing Chesapeake Bay Bridge and Chesapeake Bay Bridge-Tunnel in Virginia or would be an upgrade to the current Maryland crossing (by adding a third span).
Twelve states of the United States have designated an official state dog breed.
 Maryland was the first state to name a dog breed as a state symbol, naming the Chesapeake Bay Retriever in 1964.
 Pennsylvania followed the year after, naming the Great Dane as its official breed.
 Dog breeds are mostly affiliated with the states that they originated in.
 North Carolina chose the Plott Hound as it was the only dog breed indigenous to the state.
The American Russell Terrier Club (formerly named the English Jack Russell Terrier Club), founded by JoAnn Stoll in 1995, was the first registry in the United States to maintain the Russell Terrier as a separate breed from the Parson Russell Terrier.
 The American Jack Russell Terrier Club is affiliated with both the United Kennel Club and the American Kennel Club.
 The purpose of the early founders was to establish a registry for the perpetuation and development of the Russell Terrier as a pure strain of working Jack Russell Terrier keeping their blood and type pure within the registry to works towards Kennel Club recognition as an official breed in the US.
 On January 1, 2001, the United Kennel Club recognized the Russell Terrier as an official breed, designating only the stock from the American Russell Terrier Club as Foundation stock for the UKC Russell Terrier.
 In 2004 the American Russell Terrier Club submitted an official request to include the American Russell Terrier Club stock into the AKC FSS Program to work towards becoming an official breed under the perimeters.
 On December 8, 2004, the AKC officially accepted the Russell Terrier.
The Chesapeake Bay Retriever is a large-sized breed of dog belonging to the Retriever, Gundog, and Sporting breed groups.
 Members of the breed may also be referred to as a Chessie, CBR, or Chesapeake.
 The breed was developed in the United States Chesapeake Bay area during the 19th century.
 Historically used by area market hunters to retrieve waterfowl, it is primarily a family pet and hunting companion.
 They are often known for their love of water and their ability to hunt.
 It is a medium to large sized dog similar in appearance to the Labrador Retriever.
 The Chesapeake have a wavy coat, rather than the Labrador's smooth coat.
 They are described as having a bright and happy disposition, courage, willingness to work, alertness, intelligence, and love of water as some of their characteristics.
The Lacy Dog or Blue Lacy Dog is a breed of working dog that originated in Texas in the mid-19th century.
 The Lacy was first recognized in 2001 by the Texas Senate.
 In Senate Resolution No. 436, the 77th Legislature honored the Lacy as "a true Texas breed".
 In June 2005, Governor Rick Perry signed the legislation adopting the Blue Lacy as "the official State Dog Breed of Texas".
 As expected, the vast majority of Lacy dogs are found in Texas.
 However, as the breed becomes more well recognized, there are breeding populations being established across the United States, Canada, and most recently in Europe.
Vulnerable Native Breeds are a group of dog breeds originating in the United Kingdom and Ireland, and identified by The Kennel Club (KC) as having annual registration numbers of 300 puppies or fewer.
 The need for such a list was first identified in June 2003, with research conducted by the KC to identify the extent of the vulnerability and viability of each breed.
 It was a joint project, with the KC working with the British and Irish Native Breeds Trust, later to be known simply as the Native Dog Breeds Trust.
 The breeds on the list have been promoted at events such as Discover Dogs and Crufts, and by asking that owners of these breeds mate their dogs rather than having them spayed.
The Great Chesapeake Bay Schooner Race (GCBSR) is an annual schooner race established in 1990 that takes place on the Chesapeake Bay.
 The race—held in October of each year—begins just south of the Chesapeake Bay Bridge near Annapolis, Maryland, and ends at Thimble Shoal Light north of the Hampton Roads channel, covering 127 nmi .
 Pre- and post-race activities take place in Baltimore, Maryland, and Portsmouth, Virginia, respectively.
 Proceeds from the race support Chesapeake Bay education and preservation projects.
 The current time to beat is 11 hours, 18 minutes, 53 seconds and was set in 2007 by the schooner "Virginia".
A breed group is a categorization of related breeds of animal by an overseer organization, used to organize the showing of animals.
 In dogs, kennel clubs define the "Breed Groups" and decide which dog breeds are to be included in each breed group.
 The Fédération Cynologique Internationale breed groups are used to organize dogs for international competition.
 Breed groups often have the names of, and are loosely based on, ancestral dog types of modern dog breeds.
The Chesapeake Bay Program is the regional partnership that directs and conducts the restoration of the Chesapeake Bay in the United States.
 As a partnership, the Chesapeake Bay Program brings together members of various state, federal, academic and local watershed organizations to build and adopt policies that support Chesapeake Bay restoration.
 By combining the resources and unique strengths of each individual organization, the Chesapeake Bay Program is able to follow a unified plan for restoration.
 The program office is located in Annapolis, Maryland.

Question: The Blue Lacy, official breed of Texas, and Chesapeake Bay Retriever, are both dog breeds developed during which century?
Answer: 19th century