The Canaan Dog is a Pariah Dog of Israel and is the national dog of Israel. Nobody really knows the exact truth about their origins. These dogs are native to the Land of Canaan that made themselves useful to Bedouin and Hebrew tribes over thousands of years by herding and guarding their flocks. It is understood that the Canaan Dog is an ancient breed. Pre-biblical drawings and carvings depict dogs very similar to the Canaan Dog we know today. This breed existed solely as a free-living pariah until the end of the 1930s. The breed is a survivor, a sound and hardy animal that is capable of surviving in the very harsh environment of its natural home. A Canaan is a dog with all the traits that make them a good service dog — an alert and agile dog, being territorial and with highly developed senses. The Canaan Dog is still classified as a rare breed by The Kennel Club.
Sources: http://canaandog.co.uk/history-of-the-canaan-dog/ and http://www.fci.be/Nomenclature/Education/273g05-PRE-en.pdf
There are numerous breed standards. The basis of breed/conformation shows is the judging of pedigree dogs against the 'Breed Standard', which is a picture in words that describes the range of features that are deemed appropriate for the breed. Three of the major international standards are: