Bellybutton was a unique dog in history for his ability to dive underwater.
Bellybutton was a German shorthaired pointer who was three years old at the time this photo was taken by LIFE magazine in 1966. Bellybutton began swimming when he was a puppy and later took up diving. For a dog to go far underwater and to be able to hold its breath for long periods is unusual but Bellybutton was able to swim underwater for distances up to 20 feet and was able to remain submerged for up to 15 seconds. It was also reported that one day Bellybutton "dived unbidden into a lake and fetched his master a 10-inch catfish."