Question: Which breed of dog is now extinct: Chinese Crested Dog or the Chien-gris?

Context articles: Miss Ellie (dog)
Canine follicular dysplasia
Chinese Crested Dog
Chinese crested tern
Elwood (dog)
Chien-gris
Cynosurus cristatus
Ashleigh and Pudsey
Sam (ugly dog)
Sandwich tern

Miss Ellie (c. 1993 – June 1, 2010), a blind American Chinese Crested hairless dog, was the 2009 winner in the pedigree section of the World's Ugliest Dog Contest.
 She appeared in shows at the Comedy Barn in Pigeon Forge, Tennessee, and was featured on the Animal Planet cable show "Dogs 101".
 Dawn Goehring rescued Miss Ellie at seven years old.
 Miss Ellie died on June 1, 2010, at age 17.
Follicular dysplasia is a genetic disease of dogs causing alopecia, or hair loss.
 It is caused by hair follicles that are misfunctioning due to structural abnormality.
 There are several types, some affecting only certain breeds.
 Diagnosis is achieved through a biopsy, and treatment is rarely successful.
 Certain breeds, such as the Mexican Hairless Dog and Chinese Crested Dog, are bred specifically for alopecia.
The Chinese crested dog is a hairless breed of dog.
 Like most hairless dog breeds, the Chinese crested comes in two varieties, with and without fur, which are born in the same litter: the Powderpuff and the Hairless.
The Chinese crested tern ("Thalasseus bernsteini") is a tern in the family Laridae, closely related to the Sandwich tern, "T. sandvicensis", and the lesser crested tern, "T. bengalensis".
 It is most similar to the former, differing only in the bill pattern, which is the reverse of the Sandwich tern's, being yellow with a black tip.
 From the lesser crested tern, which it overlaps in wintering distribution, it can be told by the white rump and paler grey mantle, as well as the black tip to the bill, which seen from up close also has a white point.
 The larger greater crested tern is also similar, differing in its stouter, all-yellow bill and darker grey mantle and rump, as well as in size.
Elwood (2005 – November 28, 2013) was the 2007 winner of the World's Ugliest Dog Contest, and had come in second in the contest the year before.
 His owner was Karen Quigley, a resident of Sewell, New Jersey, United States.
 He was a two-year-old Chinese Crested/chihuahua mixed breed.
 Elwood died on November 28, 2013.
 He was eight years old.
The Chien-gris a.k.a. Gris de Saint-Louis ("Grey St. Louis Hound") was a breed of dog, now extinct, which originated in Medieval times.
 Like the Chien de Saint-Hubert it was a scenthound, and formed part of the royal packs of France, which were composed, from about 1250 till 1470, exclusively of hounds of this type.
 According to King Charles IX, (1550–1574) they supposedly were introduced to France through Saint Louis (i.e. King Louis IX, 1226–1270), who had encountered these hounds while a prisoner during the Crusades, and subsequently received some as a gift.
 Old writers on hunting liked to ascribe an ancient and remote origin to their hounds, and these were claimed to be originally from Tartary.
Cynosurus cristatus, Crested dog's-tail, is a short-lived perennial grass in the family Poaceae, characterised by a seed head that is flat on one side.
 It typically grows in species rich grassland.
 It thrives in a variety of soil types but avoids the acid and calcareous extremes of pH, and prefers well drained soils.
 It may be grown as an ornamental plant.
Ashleigh and Pudsey is a British dog trick act, comprising trainer Ashleigh Jade Butler (born 7 February 1995) and Pudsey.
 Pudsey (28 December 2005 – 20 July 2017) was a male Border Collie, Bichon Frise, and Chinese Crested powderpuff cross.
 They first achieved prominence as contestants in the sixth series of the television talent show "Britain's Got Talent", which they won on 12 May 2012, becoming the first ever dog trick act to win the competition.
Sam (November 7, 1990 – November 18, 2005) was a blind pure-bred Chinese Crested hairless and toothless dog, and three time champion of the annual Sonoma-Marin Fair World's Ugliest Dog Contest in Northern California in 2003–2005.
 His ugliness gained him international fame and celebrity – his death was a top headline on major news websites.
The Sandwich tern ("Thalasseus sandvicensis") is a tern in the family Laridae.
 It is very closely related to the lesser crested tern ("T. bengalensis"), Chinese crested tern ("T. bernsteini"), Cabot's tern ("T. acuflavidus"), and elegant tern ("T. elegans") and has been known to interbreed with the lesser crested.