A music teacher and Maccabiah Games team manager, is recovering from a testicle-saving operation after being bitten in the groin by a dog.
Joel Goodman, 28, was attacked while out jogging and underwent emergency surgery to save his testicle.
He said the brown and white dog, thought to be an English Bull Terrier, had pounced without warning.
The animal’s owner spoke to Mr Goodman following the incident, but offered no assistance, saying only that he was not from the area before walking off with the dog.
Mr Goodman alerted a neighbour who rushed him to hospital. He has been unable to return to work as a piano and singing teacher since the attack, in Epping, Essex, a fortnight ago.
He appealed for the dog to be caught and put down, and its owner – thought to be an eastern European man in his 30s or 40s, be prosecuted.
Mr Goodman, who is due to manage Team GB's athletics team at this summer's Maccabiah in Israel, said this week he needed “space and time” to recover from his injuries.