Question: Which dog breed, Cirneco dell'Etna or Flat-Coated Retriever, is primarily built for endurance over harsh terrain?

Context articles: Andalusian Hound
Shargleam Blackcap
List of U.S. state dogs
Flat-Coated Retriever
Cirneco dell'Etna
Curly Coated Retriever
Mongol Derby
Chesapeake Bay Retriever
Tolfetano
Vbos The Kentuckian

The Andalusian hound (Spanish: "Podenco andaluz" ) is a dog breed originating in Spain, especially Andalusia.
 These dogs are similar to other Iberian breeds such as the Ibizan Hound, the Portuguese Podengo, the Podenco Canario and the Maneto.
 In the Iberian Peninsula there are cave paintings representing dogs with a strong resemblance to these races.
 Dogs very similar to these, including the Cirneco dell'Etna and Pharaoh Hound, have been bred in much of the Mediterranean basin since ancient times.
 Despite the widespread belief that the podencos were introduced into Spain some 3,000 years ago by the Phoenicians, recent genetic studies have concluded that these dogs actually have a close genetic relationship with other European hunting dogs and are no more "primitive" than the others.
Ch.
 Shargleam Blackcap, (born 26 June 1977), also known as Brett is a Flat-Coated Retriever show dog bred and handled by Mrs Pat Chapman who won Best in Show at Crufts in 1980.
 He is one of the ancestors of 2011 Crufts Best in Show Sh Ch.
 Vbos The Kentuckian.
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 Flat-Coated Retriever is a gundog breed originating from the United Kingdom.
 It was developed as a retriever both on land and in the water.
The Cirneco dell'Etna (] ; plural "Cirnechi" [tʃirˈnɛki] ) is a small breed of dog originally from Italian island of Sicily.
 This hound was historically used to hunt rabbits and can work for hours without food or water.
 The breed also has a keen sense of smell and is primarily built for endurance over harsh terrain such as that of Mount Etna.
 It is the smallest of the Mediterranean island hunting hounds, the others being the Pharaoh Hounds and Ibizan Hounds.
The Curly Coated Retriever (often referred to as a Curly) is a breed of dog originally bred in England for upland bird and waterfowl hunting.
 It is the tallest of the retrievers and is easily distinguishable by the mass of tight curls covering its body.
 Curly Coated and Wavy Coated (now known as the Flat-Coated Retriever) were the first two recognised retriever breeds, established as early as 1860.
The Mongol Derby is an equestrian endurance race.
 The race extends 1000 km through the Mongolian Steppe and is known as the world's longest horse race.
 The course recreates the horse messenger system developed by Ghengis Khan in 1224.
 In the 2016 race, there will be 21 men and 23 women playing the role of the messengers, and representing 13 countries.
 The exact course changes every year, and is kept secret until shortly before the race begins.
 The terrain will invariably include mountain passes, green open valleys, wooded hills, river crossings, wetland and floodplains, sandy semi-arid dunes, rolling hills, dry riverbeds and of course open steppe.
 The entry fee is $13,000, and provides the rider access to 30 Mongolian horses, a support team, pre-race training, and access to the support stations along the way.
 Riders must change horses every 40 km at the support stations.
 Along the way are vet checks to monitor the condition of the horses, and the vets may impose time penalties if the riders push their horses too hard along the trail.
 To gain entry as a competitor, each rider must demonstrate that their riding skills are strong enough to endure the harsh terrain of the race.
 The horses themselves are semi-wild, and may not cooperate with the rider, adding one more level of difficulty to the race.
 Riders will spend thirteen to fourteen hours a day in the saddle, and the race lasts ten days.
 To complete the race is an accomplishment in and of itself, as only half the racers usually finish the race in any given year.
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 Tolfetano or Cavallo Tolfetano is a breed of horse from the northern part of the Lazio region of Italy.
 It is indigenous to the Monti della Tolfa range of hills which lie within the Maremma Laziale, and which give the breed its name.
 The harsh terrain and limited resources of the area are thought to have contributed to the resistant and frugal nature of the breed.
Sh Ch.
 Vbos the Kentuckian (30 August 2001 - 3 June 2013), also known as Jet, was a Flat-Coated Retriever show dog bred and handled by Jim Irvine who won Best in Show at Crufts in 2011.
 He was descended from the 1980 Best in Show winner, Ch.
 Shargleam Blackcap, and placed Best in Show at several other shows around the UK including the Gundog Society of Wales and the National Gundog Association.