According to the Guinness Book of Records: 

• The longest lived dog in the world remains “Bluey,” an Australian Cattle Dog;
• “Sailor,” a Poodle, holds the record for fastest 10m on a walking globe by a dog;
• The 1973 edition of The Guinness Book of Records stated that the rarest breed of dog in the world was the Lowchen. Five years later, Guinness listed the Chinese Shar-Pei as the rarest breed in the world;
• The tallest dog in the world is a Great Dane;
• The world’s oldest known dog breed is the Saluki;
• The most intelligent of all dog breeds is the Border Collie (we know, we know, take it up with Guinness);
• The most balls caught by a dog’s paws in a minute was 14 balls, and the paws that did it belonged to Purin, a Beagle;
• The world record for the fastest 30 meters on a scooter by a dog is held by a Briard named, “Norman;”
• The fastest dog on two paws is a Pomerannian named, “Jiff;”
• “Bruschi,” a  Boston terrier holds the Guinness World Record for dog with the largest eyes;
• Twinkie, a Jack Russell terrier, holds the record for the fastest time to pop 100 balloons by a dog;
• The most tennis balls held in a dog’s mouth at the same time is five, and the dog that did it is “Augie,” a Golden Retriever from Texas;
• The wealthiest dog was probably “Toby,” a standard Poodle who was bequeathed $15 million dollars in 1931 by his mistress, Ella Wendel of New York City.  After her death, Toby was looked after by three servants;
• The fastest time to climb 20 stairs on his hind legs belongs to a Chinese Poodle named, “Arsenal” who did it in just 7.47 seconds on the set of CCTV’s Guinness World Records Special in Beijing in 2016. His owner, Xu Ligang, had to tell the eager dog to “slow down” during the attempt out of fear the dog might lose his balance;
• “Tubby,” a Labrador Retriever,  in the U.K. set a world record in 2010 for “recycling” more bottles than any other dog (technically speaking, Tubby collected about 26,000 plastic bottles over six years by collecting them on his daily walks, crushing them and passing them to his owner);
• The late “Tigger,” a Bloodhound from Illinois who passed away in 2009, still holds the world record for having the longest ears on a dog in history. It was another purebred dog who almost, but not quite, snagged the record in 2010,  a Coonhound;
• Both the smallest by length, and the smallest by height records are held by Chihuahuas;
• The longest tongue on record (at 4/5″ long) belongs to “Puggy”, a Pekingese;
•  A Neapolitan Mastiff named “Tia,” had the largest litter on record witha total of 24 living pups;
• The world record for the highest jump cleared by a dog is 68 inches and was achieved by a Greyhound named “Cinderella May” at the Purina Incredible Dog Challenge National Finals in October 2006;
• “Charlie,” a Golden Retriever from Australia, let out the loudest bark ever recorded at a massive 113.1 decibels (that’s about as loud as a jackhammer);
• An Irish Wolfhound named, “Finnegan,” holds the record for having the longest canine tail in the world at 28.46 inches;
• “Seven,” a German Shorthaired Pointer became the Ultimate Air Dog Champion at the Purina Incredible Dog Challenge when he long jumped 30 feet and 4 inches into the air to catch a frisbee –  about twelve inches more than the Long Jump record of 29 feet, 4.5 inches set by U.S. Olympic Athlete Mike Powell in Tokyo on August 30, 1991;
• A Newfoundland set a World Record on June 11th, 2013 on the Kaarster lake in Germany when “Jack the Black,” retrieved a person out of the water swimming 82 feet in only 36.812 seconds. The title was made official by the TV show Guinness World Records that also aired in Germany;
• We don’t know the specific breeds, but 182 different breeds took part in the world’s largest dog walk. It involved 22,742 dogs and happened on the Leas, South Shields in 2011;
• The smallest service dog is “Cupcake,” a female long-haired Chihuahua, who measured 15.87 (6.25 in) tall on September 8 2012;
• The most consecutive pieces of dog food caught by a dog was 76 pieces of dog food in a row caught by “Loki,” a Beagle;
• An 11-month-old red Tibetan Mastiff became the world’s most expensive dog when a Chinese multi-millionaire paid $1,513,417 paid for him 2011.
• We can’t verify that the Komondor was once listed as having the longest continuously growing coat of any dog, but we can believe it. 

Many honorable mentions go to our mixed breed counterparts, and to learn more about them, visit the Guinness Book of Records.