When he heard cries for help, he would dive into the water and pull the victim to safety. That's him below pictured with his owner, William Thomas.
When he died in October 1937 after eating rat poison, townsfolk built a monument to him, located on the Promenade in Swansea near St. Helen's Rugby/Cricket Ground.
Swansea Jack in 1936 received the "Bravest Dog of the Year" award from the London Star newspaper. He received a silver cup from the Lord Mayor of London and he is still the only dog to have been awarded two bronze medals by the National Canine Defence League (now known as Dogs Trust). In 2000,he was named 'Dog of the Century'
The memorial is still there and is well looked after. It is at the start of the lovely promenade from Swansea City centre to The Mulmbles for all to see.