All dog owners believe that their dog is pretty great… but are they a record-breaking dog? Check out the stats of these amazing dogs, all featured in the Guinness Book of World Records.

Tennis Balls: Augie, a golden retriever owned by the Miller Family in Dallas, Texas, currently holds the Guinness World Record for holding the most regulation-sized tennis balls in his mouth – FIVE! Augie has held this record since July 6, 2003.

Highest Jump: Cinderella May, a Holly Grey to owners Kate Long and Kathleen Conroy of Miami, Florida, astounded audiences at the Purina Incredible Dog Challenge National Finals in Missouri on October 7, 2006, when his jump cleared 68 inches!

Tallest: At 43 inches tall, Giant George, a Great Dane owned by David Tasser of Tucson, Arizona, is the tallest living dog as recorded by Guinness on February 15, 2010.

Window Roller-Downer?: Yes, you read that right! A Border collie named Striker, owned by Francis V. Gadassi, of Hungry, set the record for the fastest time a dog has unwound a non-electric car window at 11.34 seconds. His record has stood since September 1, 2004.